dexa_twice_yearly

TL3 Regular · Calgary, CA

Body composition measurement and its considerable error bars. Two scans a year, same machine, same technician.

Joined 2 October 2024 · last posted 5d · groups: wiki-editors

144 posts, newest first. Showing up to 150.

Seven-day rolling means and why weekly readings mislead Replied, post #88 · Outcomes › Progress reports · 23 Jul 2026 · 26 likes If a pattern survives a rolling-mean treatment it is worth explaining. Most do not, and that is the useful finding. That has held every time I have looked, which is not…
PIONEER 6 cardiovascular safety, read as a safety trial rather than an efficacy one Replied, post #12 · Compounds › Oral incretins · 20 Jul 2026 · 0 likes Excipients are not inert from an analytical point of view. A certificate for a formulated tablet has to account for them, and one that reports a purity figure without…
Prior authorisation: what the criteria usually require — a second dataset Replied, post #43 · Access › Insurance & coverage · 19 Jul 2026 · 0 likes Adding the measurement that post #41 says would settle it. The single most useful preparation is obtaining the actual criteria document rather than working from what…
Packaging that arrived damaged: documenting it properly Replied, post #43 · Sourcing › Logistics · 16 Jul 2026 · 22 likes I had written a reply contradicting post #39 and deleted it. Here is what survived. Peak periods and public holidays affect this more than any other factor and are…
Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #60 · Analytics › HPLC & UHPLC · 14 Jul 2026 · 0 likes Column temperature affects retention and selectivity and is omitted from most certificates. Two runs at twenty-five and forty degrees are not the same method. Noting…
How to ask a question when you cannot say why you are asking it Replied, post #38 · Start Here › How to Ask · 12 Jul 2026 · 9 likes A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers before you post either.
Revisiting: PCOS and metabolic overlap: what is and is not studied Replied, post #52 · Clinical › Comorbidities · 9 Jul 2026 · 32 likes What I want from this PCOS and metabolic overlap thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can check…
Rewriting my first post: a before-and-after, with commentary — what changed since Replied, post #14 · Start Here › How to Ask · 8 Jul 2026 · 0 likes Chromatography questions need the method before anything else: column, gradient, wavelength, injection volume. A purity figure with no method attached cannot be…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #53 · Evidence › Journal club · 29 Jun 2026 · 6 likes Trying to state the STEP 1 position in a way that someone who disagrees would recognise as fair, because I do not think the version in this thread passes that test.
Revisiting: The best-written scientific paper you have read Replied, post #58 · Lounge › Off topic · 28 Jun 2026 · 1 like Off-topic but genuinely curious: how many people here came in through the analytics side rather than the practical side? The two groups seem to read completely…
Packaging that arrived damaged: documenting it properly Replied, post #32 · Sourcing › Logistics · 27 Jun 2026 · 6 likes I read post #30 twice before replying, because I had assumed the opposite. Import restrictions by jurisdiction: what is legal to import for personal use varies…
What published stability data actually covers, and what it does not Replied, post #8 · Practice › Storage & stability · 27 Jun 2026 · 19 likes Room-temperature stability claims for licensed products in this class are specific about duration and about whether the period is cumulative. Cumulative is the word…
Sleep apnoea improving and the equipment implications Replied, post #9 · Wellbeing › Sleep · 26 Jun 2026 · 0 likes Quietly grateful for the plain phrasing. Not every thread gets that.
Constipation management, with a dietitian's contribution Replied, post #82 · Practice › Side effects · 22 Jun 2026 · 13 likes I read post #79 twice before replying, because I had assumed the opposite. The reason constipation management keeps being re-asked is that the answer is conditional and…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #102 · Practice › Reconstitution · 11 Jun 2026 · 13 likes How much of the diluent volume the powder itself displaces: for a small peptide vial, the powder volume is negligible. For a larger vial or a kit with multiple…
Revisiting: The best-written scientific paper you have read Replied, post #25 · Lounge › Off topic · 10 Jun 2026 · 21 likes Counterpoint on best-written scientific paper, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #83 · Sourcing › Logistics · 28 May 2026 · 0 likes Anyone deciding whether a delay is a problem should ask what would change if they waited another week. Usually the answer is nothing. Take it as a starting point and…
Transporting a vial for a weekend away — a second dataset Replied, post #62 · Practice › Storage & stability · 24 May 2026 · 33 likes Temperature excursions: if a vial sat at room temperature for a time, the question is whether the excursion was long enough to cause damage. Hours at room temperature…
Revisiting: Can a home kit substitute for a laboratory report? A careful no Replied, post #24 · Analytics › Home & field testing · 23 May 2026 · 9 likes The version of home kit substitute that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it holds,…
Peak-to-trough ratio at steady state for a weekly agent — the long version Replied, post #7 · Pharmacology › Pharmacokinetics · 19 May 2026 · 7 likes I read post #5 twice before replying, because I had assumed the opposite. I would put moderate confidence on the mainstream reading of Peak-to-trough ratio and no more.…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #130 · Compounds › Tirzepatide · 19 May 2026 · 0 likes Answering the question post #128 raises rather than the one it answers. Trying to state the 2.5 mg starting dose position in a way that someone who disagrees would…
Reading a trial's population section before its results Replied, post #30 · Evidence › Trials · 18 May 2026 · 0 likes Entry criteria, run-in periods and the self-selection of people willing to enter a multi-year trial all narrow the population. That is how internal validity is bought…
Transporting a vial for a weekend away — a second dataset Replied, post #53 · Practice › Storage & stability · 14 May 2026 · 21 likes This follows post #50 rather than contradicting it. A definition problem is doing most of the work in this Transporting a vial discussion. Once the term is pinned down…
Why retatrutide discussion here is more cautious than elsewhere Replied, post #9 · Compounds › Retatrutide · 29 Apr 2026 · 3 likes Post #5 and I disagree about the size of the effect, not about the direction. Triple agonism: is the effect additive, synergistic, or neither? A phase 2 comparison of…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #22 · Practice › Reconstitution · 18 Apr 2026 · 25 likes Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does. Reading it…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #13 · Practice › Reconstitution · 18 Apr 2026 · 15 likes On a U-100 insulin syringe, one hundred units is one millilitre and one unit is 0.01 millilitres. Units are volume marks. They mean nothing until you know the…
Follow-up: The retatrutide phase 2 obesity paper, read closely Replied, post #9 · Compounds › Retatrutide · 11 Apr 2026 · 0 likes Mass and identity: a report on retatrutide should state the mass detected by LC-MS, not assume a theoretical mass. The theoretical mass is not published in…
Spike-and-recover accuracy for a peptide assay Replied, post #37 · Analytics › Method validation · 8 Apr 2026 · 0 likes Nobody has said the unglamorous part of spike-and-recover accuracy yet, so: most of the variation is explained by things that are boring to write about and easy to check.
Foaming during reconstitution and whether it matters — the long version Replied, post #77 · Practice › Reconstitution · 27 Mar 2026 · 9 likes Fine by me. I had wanted a stronger conclusion and there is not one available.
Grapefruit: why this class is not the class that cares Replied, post #74 · Practice › Interactions · 24 Mar 2026 · 5 likes Agreed, and I will stop repeating the version of this I had been repeating.
Introducing myself: pharmacist, sceptic, reluctant participant — one year on Replied, post #36 · Lounge › Introductions · 11 Mar 2026 · 26 likes Hello. Fair warning that this place will change how you read a certificate, and that you will not be able to go back to accepting one at face value.
Restarting after a long gap: what the labelling implies — the long version Replied, post #6 · Practice › Dosing & titration · 5 Mar 2026 · 2 likes This follows post #5 rather than contradicting it. Concentration and dose get conflated constantly in this subcategory. Changing how much diluent you add changes the…
Reading SURMOUNT-1 without the press release — one year on Replied, post #51 · Compounds › Tirzepatide · 27 Feb 2026 · 26 likes Confirming post #48 from a second method, which matters more than confirming it from a second person. Small methodological point on Reading SURMOUNT-1 without the…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #3 · Evidence › Preprints · 26 Feb 2026 · 6 likes Picking up the opening post: that is the part I would want checked first. The honest position on most preprints in this field is that they are interesting and…
Why the timeline is on the right and not the left — what changed since Started this topic · Meta › Site feedback · 24 Feb 2026 · 0 likes Why the timeline is on the right and not the left — what changed since I have a specific reason for asking rather than idle curiosity, and the context is below. What…
Seven-day rolling means and why weekly readings mislead — one year on Replied, post #28 · Outcomes › Progress reports · 10 Feb 2026 · 1 like Weighing daily and reporting weekly is a better protocol than weighing weekly, because it separates the measurement frequency from the reporting frequency.
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #82 · Access › Pricing · 6 Feb 2026 · 2 likes Post #79 answers the question as asked. The question underneath it is different. The version of Price changes that I was taught turned out to be a teaching…
Packaging that arrived damaged: documenting it properly — a second dataset Replied, post #33 · Sourcing › Logistics · 4 Feb 2026 · 2 likes I had written a reply contradicting post #31 and deleted it. Here is what survived. Import restrictions by jurisdiction: what is legal to import for personal use varies…
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #20 · Data & Tools › Datasets · 29 Jan 2026 · 8 likes Post #17 is the version of this I will quote in future. One addition. Date every record. A dataset assembled over two years without dates cannot distinguish a change…
Second pass at: Pregnancy and pregnancy planning: contraindication and washout Replied, post #108 · Clinical › Special populations · 26 Jan 2026 · 0 likes Pregnancy and pregnancy planning would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.
Pre-registering a personal experiment, seriously — a second dataset Replied, post #24 · Research Methods › N-of-1 designs · 24 Jan 2026 · 16 likes Record everything that changed, not just the intervention. Personal experiments are confounded by life, and the confounders are only recoverable if they were written…
When to stop reading forums, including this one Replied, post #79 · Wellbeing › Mental health · 22 Jan 2026 · 0 likes If you are in crisis, contact a local emergency or crisis service rather than posting. A volunteer forum cannot help and waiting costs time. That is the shape of it.…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one — one… Replied, post #10 · Compounds › Oral incretins · 9 Jan 2026 · 0 likes Quietly grateful for the plain phrasing. Not every thread gets that.
A 40-week log with the measurement method stated — does this still hold? Replied, post #2 · marked as the solution · Outcomes › Progress reports · 7 Jan 2026 · 7 likes Building on the opening post rather than restating it. Offering a way to settle 40-week log rather than another opinion about it. Two measurements, taken the same way,…
Waist circumference technique and its repeatability Replied, post #35 · Outcomes › Progress reports · 5 Jan 2026 · 20 likes Building on post #34 rather than restating it. Adding the boring version of waist circumference technique, because the interesting version keeps getting posted and the…
Analytical identity of BPC-157: a 15-mer with a simple mass — does this still hold? Replied, post #3 · Compounds › Repair & healing peptides · 4 Jan 2026 · 29 likes BPC-157: the preclinical literature is extensive, mostly from a small number of research groups, and reports effects across a wide range of injury models. The breadth…
What "verified" means on our vendor pages, stated narrowly Replied, post #29 · Sourcing › Vendor reports · 2 Jan 2026 · 0 likes The arithmetic in post #26 is right; the assumption feeding it is the part to check. Do not adjust a reported figure. Post what the laboratory said and put your…
Warfarin and altered intake: the monitoring argument — the long version Replied, post #81 · Practice › Interactions · 2 Jan 2026 · 0 likes This follows post #80 rather than contradicting it. I would put moderate confidence on the mainstream reading of Warfarin and altered intake and no more. That is not…
Guidelines revision: what changed and why — one year on Replied, post #52 · Meta › Announcements · 30 Dec 2025 · 0 likes Thank you for announcing it in advance rather than after. The number of places that do the reverse is remarkable. This is where my knowledge stops and I would rather…
Injection volume, overload, and peak distortion — one year on Started this topic · Analytics › HPLC & UHPLC · 2 Dec 2025 · 57 likes Injection volume, overload, and peak distortion — one year on Writing it up because I had to work it out twice and would rather nobody else did. Posting a small dataset…
Second pass at: Robustness: the parameters worth deliberately varying Replied, post #29 · Analytics › Method validation · 28 Nov 2025 · 0 likes Adding the measurement that post #28 says would settle it. The version of Robustness that I was taught turned out to be a teaching simplification. Useful, and not true…
Reconstitution volumes that produce round numbers, tabulated Replied, post #2 · Practice › Reconstitution · 28 Nov 2025 · 1 like Nothing to add on the substance. Thank you for taking the question at face value.
Tracking a preprint to publication: a worked example Replied, post #4 · Evidence › Preprints · 28 Nov 2025 · 13 likes Picking up the opening post: that is the part I would want checked first. Reading a preprint properly means doing some of the reviewer's job: methods first, then…
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #52 · Sourcing › Regulatory · 27 Nov 2025 · 1 like Whatever the answer on Pharmaceutical compounding rules turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public,…
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #90 · Compounds › Other compounds · 26 Nov 2025 · 29 likes No disagreement from me. Posting only so the question does not look ignored.
Absence of evidence and evidence of absence Replied, post #6 · Research Methods › Statistics · 20 Nov 2025 · 6 likes Absence of evidence has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
Pen dose counters: what a click does and does not guarantee Replied, post #33 · Devices › Pens & autoinjectors · 14 Nov 2025 · 0 likes Coming back to post #29, because the follow-up matters more than the original answer. The click count on a dialled pen is a mechanical property of that pen and is not a…
Can a home kit substitute for a laboratory report? A careful no Replied, post #53 · Analytics › Home & field testing · 13 Nov 2025 · 2 likes Understood. Thank you for being specific about the limits of it.
Thyroid function tests during substantial weight change Replied, post #118 · Clinical › Bloodwork · 2 Nov 2025 · 6 likes Renal function markers: eGFR is estimated, not measured. It depends on creatinine, age, and weight. A small change in creatinine might not mean a real change in kidney…
What pooling buys you and what it destroys Replied, post #50 · Evidence › Meta-analyses · 25 Oct 2025 · 0 likes What I would tell a new member reading about pooling buys for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #101 · Start Here › Welcome · 22 Oct 2025 · 10 likes Reading counts toward trust level, so lurking is not wasted. That is unusual and it is the reason the levels here track familiarity rather than volume.
A 40-week log with the measurement method stated Replied, post #6 · Outcomes › Progress reports · 13 Oct 2025 · 14 likes Marking my uncertainty on 40-week log explicitly. I am confident about the direction, much less confident about the size, and not confident at all that it generalises…
Specification in the result column: why that is a meaningful error Replied, post #55 · Analytics › COA interpretation · 8 Oct 2025 · 5 likes A document that puts the specification in the result column has told you the release criterion rather than the measurement. Those are different claims and the…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #45 · Analytics › COA interpretation · 2 Oct 2025 · 17 likes An itemised related-substances table with retention times says considerably more about the synthesis than a single total. A total tells you how much is not the main…
Second pass at: How to ask a question when you cannot say why you are asking it Replied, post #18 · Start Here › How to Ask · 27 Sep 2025 · 1 like If your question has a deadline — a parcel in transit, a delivery you have to accept or refuse — say so. People answer differently when there is a clock on it.
[2026 update] A single out-of-range value on an otherwise normal panel Replied, post #12 · Clinical › Bloodwork · 25 Sep 2025 · 10 likes Post #11 answers the question as asked. The question underneath it is different. Where a panel includes a calculated value, that value inherits the imprecision of…
Tracking that stops updating and then resumes Replied, post #29 · Sourcing › Logistics · 23 Sep 2025 · 18 likes Confirming post #27 from a second method, which matters more than confirming it from a second person. Document outcomes rather than forecasting them. A forecast in this…
A parcel that arrived warm: a decision process, not a verdict Replied, post #48 · Practice › Storage & stability · 21 Sep 2025 · 3 likes Confirming post #47 from a second method, which matters more than confirming it from a second person. Clarity is a weak test. A solution can lose a significant fraction…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #34 · Analytics › COA interpretation · 12 Sep 2025 · 17 likes Post #30 describes the usual case. This is about the unusual one. An itemised related-substances table with retention times says considerably more about the synthesis…
Aggregated purity results across four services, with caveats — a second dataset Replied, post #44 · Data & Tools › Datasets · 8 Sep 2025 · 0 likes Combining results from different testing services into one column loses information that matters. Keep the service as a field. Worth one more sentence than it usually…
Aggregated purity results across four services, with caveats — a second dataset Replied, post #13 · Data & Tools › Datasets · 6 Sep 2025 · 8 likes Units in the column header, always, and the same units down the whole column. Mixed units in one field is the commonest defect in shared spreadsheets here.
Which panel is worth repeating and which is worth ignoring Replied, post #101 · Clinical › Bloodwork · 3 Sep 2025 · 7 likes That is a cleaner way of putting what I was circling around.
Follow-up: Journal club: orforglipron phase 2 and the non-peptide question Replied, post #50 · Evidence › Journal club · 26 Aug 2025 · 1 like I had written a reply contradicting post #46 and deleted it. Here is what survived. Filing a mild objection to the consensus on orforglipron phase 2. Mild because I…
Why "add 2 mL" is not an instruction — a second dataset Replied, post #3 · Practice › Reconstitution · 23 Aug 2025 · 16 likes Confirming the opening post from a second method, which matters more than confirming it from a second person. Working out the concentration after the fact from the…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #27 · Pharmacology › Receptor biology · 14 Aug 2025 · 2 likes I had written a reply contradicting post #25 and deleted it. Here is what survived. GIP receptor biology is genuinely contested. Both agonism and antagonism have been…
Asking about a compound your prescriber has not heard of Replied, post #121 · Clinical › Prescriber conversations · 10 Aug 2025 · 32 likes If you have been doing something the prescriber does not know about, saying so is more useful than not. Clinicians here consistently say they would rather know. If this…
How to research a compound with no human data without deceiving yourself Replied, post #30 · Compounds › Other compounds · 31 Jul 2025 · 10 likes Adding a reference point for research a compound. Mine is a single case, collected without controls, and I am posting the method alongside it so it can be discounted…
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #18 · Compounds › Secretagogues & GH axis · 28 Jul 2025 · 0 likes Understood. Thank you for being specific about the limits of it.
Why semaglutide solutions can look faintly opalescent and when that matters Replied, post #4 · Compounds › Semaglutide · 28 Jul 2025 · 0 likes Building on post #3 rather than restating it. Agreed on semaglutide solutions, with one qualification that I think matters. The reasoning holds for the case as…
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes Replied, post #21 · Compounds › Oral incretins · 26 Jul 2025 · 12 likes The absorption enhancer in the licensed oral product works by transiently raising local gastric pH and promoting absorption across the mucosa. It is the reason the…
Escalating every six weeks instead of four: what I observed over eight months — one year… Replied, post #44 · Practice › Dosing & titration · 25 Jul 2025 · 4 likes The four-week escalation interval is a convention from the pivotal trials, not a pharmacological constant. The pharmacological argument is that with a week-long…
A calculator that gives a right answer to the wrong question — does this still hold? Replied, post #2 · Data & Tools › Calculators · 23 Jul 2025 · 30 likes Nobody has said the unglamorous part of calculator yet, so: most of the variation is explained by things that are boring to write about and easy to check.
Are there stupid questions here? A staff answer, at length Replied, post #7 · Start Here › Welcome · 23 Jul 2025 · 0 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Older adults, sarcopenia risk, and the trade-off nobody quantifies — the long version Replied, post #2 · Clinical › Special populations · 20 Jul 2025 · 0 likes Older adults has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
Reconstituting a multi-strength kit without mixing yourself up Replied, post #100 · Practice › Reconstitution · 14 Jul 2025 · 3 likes Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile…
Coming back to: Why semaglutide solutions can look faintly opalescent and when that… Replied, post #15 · Compounds › Semaglutide · 3 Jul 2025 · 0 likes Coming back to post #11, because the follow-up matters more than the original answer. On semaglutide solutions, the part that usually goes wrong is that the question is…
A comparison of home results against a laboratory result on the same vial Replied, post #10 · Analytics › Home & field testing · 1 Jul 2025 · 11 likes Nothing available at home distinguishes a correct sequence from a closely related incorrect one. That gap is fundamental rather than a matter of kit quality.
Coming back to: What published stability data actually covers, and what it does not Replied, post #73 · Practice › Storage & stability · 27 Jun 2025 · 4 likes Confirming post #70 from a second method, which matters more than confirming it from a second person. Reframing published stability data actually covers slightly,…
Follow-up: The decimal-point error, and the habit that catches it Replied, post #12 · Practice › Reconstitution · 15 Jun 2025 · 3 likes Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does.
Follow-up: Tracking intake honestly when appetite is absent Replied, post #80 · Nutrition & Training › Protein & intake · 13 Jun 2025 · 0 likes I had written a reply contradicting post #78 and deleted it. Here is what survived. The version of Tracking intake that circulates here is a simplification of a…
[2026 update] An appeal that failed, and what I would do differently Replied, post #94 · Access › Insurance & coverage · 13 Jun 2025 · 14 likes Building on post #93 rather than restating it. My experience of appeal contradicts the reply above. I am posting it as a data point rather than as a refutation, because…
[2026 update] An appeal that failed, and what I would do differently Replied, post #83 · Access › Insurance & coverage · 12 Jun 2025 · 1 like Appeal sits at the boundary between what this community can usefully discuss and what it cannot, and I think it falls on the discussable side, narrowly.
Coming back to: Getting a referral rather than a refusal Replied, post #50 · Clinical › Prescriber conversations · 9 Jun 2025 · 1 like Post #46 and I disagree about the size of the effect, not about the direction. An update on my earlier Getting a referral post: the pattern held for another six weeks…
IGF-1 as a surrogate endpoint and its limitations — the long version Replied, post #7 · marked as the solution · Compounds › Secretagogues & GH axis · 8 Jun 2025 · 6 likes Building on post #6 rather than restating it. IGF-1 is a question about a distribution, not about a value, and treating it as a value is what produces the confident…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #3 · Pharmacology › Receptor biology · 30 May 2025 · 0 likes In vitro potency and clinical potency are related by a long chain of assumptions. A compound more potent at the receptor is not necessarily more effective at a…
Pre-registering a personal experiment, seriously Replied, post #49 · Research Methods › N-of-1 designs · 30 May 2025 · 6 likes Where the pre-registering a personal experiment reasoning breaks down for me is the step from the group result to the individual case. That step is almost never argued…
Publishing an inconvenient result: a case study Replied, post #25 · Sourcing › Independent verification · 26 May 2025 · 10 likes Post #24 answers the question as asked. The question underneath it is different. Repeat determination on the same product line months apart is the measurement that…
DXA precision and the least significant change for lean mass — the long version Replied, post #67 · Outcomes › Body composition · 20 May 2025 · 1 like This follows post #64 rather than contradicting it. Lean mass loss during rapid weight reduction: depends on protein intake, resistance training volume, and total…
Follow-up: Tesamorelin has an approved indication — what that changes about the evidence Replied, post #62 · Compounds › Secretagogues & GH axis · 14 May 2025 · 2 likes What a well-designed human trial of a secretagogue would look like: randomised, placebo-controlled, adequate sample size, IGF-1 as primary outcome, muscle and strength…
Hepatic steatosis: what the MASH trial evidence supports Replied, post #38 · Clinical › Comorbidities · 12 May 2025 · 31 likes Coming back to post #36, because the follow-up matters more than the original answer. Bariatric surgery history: altered anatomy after surgery affects absorption. That…
Follow-up: What other technical communities get right that we do not Replied, post #93 · Lounge › Off topic · 10 May 2025 · 3 likes Industry and supply chain: post about manufacturing, pharmaceutical economics, or market dynamics if you have something substantive to contribute. I am not the right…
A newcomer's list of things that confused me, and the fixes Replied, post #10 · Start Here › Welcome · 8 May 2025 · 0 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
Follow-up: History of disordered eating and why it changes the conversation Replied, post #6 · Clinical › Special populations · 8 May 2025 · 7 likes That reframing is the whole thing. The facts I already had.
Follow-up: Documentation that appears only after payment Replied, post #33 · Sourcing › Red flags · 30 Apr 2025 · 22 likes Answering the question post #31 raises rather than the one it answers. I read the earlier replies on Documentation twice before writing this, because I had assumed the…
Validating a calculator against hand arithmetic — what changed since Replied, post #33 · Data & Tools › Calculators · 25 Apr 2025 · 0 likes Practical note on Validating a calculator against hand: write down what you expect before you look. The number of times I have found what I went looking for is higher…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #53 · Practice › Reconstitution · 19 Apr 2025 · 1 like Where I part company with post #49, and it is a narrow parting. Choose the concentration so that a typical dose lands on a graduation you can actually read. A dose that…
Carryover and the ghost peak from last week's standard Replied, post #75 · Analytics › HPLC & UHPLC · 10 Apr 2025 · 0 likes I would be cautious about generalising from the carryover example above. It is a good example. It is one example.
Coming back to: Sample size calculations, read backwards from the published number Replied, post #10 · Evidence › Trials · 8 Apr 2025 · 0 likes I read post #9 twice before replying, because I had assumed the opposite. Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation…
Retatrutide dose escalation in the published trials Replied, post #83 · Compounds › Retatrutide · 3 Apr 2025 · 13 likes Reading rather than contributing, but this is the most useful thread I have found on it.
Scheduled maintenance and what will be unavailable Replied, post #95 · Meta › Announcements · 2 Apr 2025 · 1 like Thank you for announcing it in advance rather than after. The number of places that do the reverse is remarkable. That is a description of practice, not a…
Counter-ion form: the field almost nobody reports — one year on Replied, post #135 · Analytics › COA interpretation · 28 Mar 2025 · 20 likes Bookmarking this. I will come back when I have something worth adding.
Publishing an inconvenient result: a case study Replied, post #2 · Sourcing › Independent verification · 25 Mar 2025 · 20 likes Answering the question the opening post raises rather than the one it answers. Checked the publishing an inconvenient result claim against the primary source this…
Journal club: STEP 4 and what a withdrawal design can prove — one year on Replied, post #49 · Evidence › Journal club · 24 Mar 2025 · 0 likes Bringing the previous paper on the same question makes the session much better and doubles the preparation. Worth doing every third session rather than every one. The…
Second pass at: Cross-border purchase within the EU: the actual rules Replied, post #97 · Access › International · 13 Mar 2025 · 0 likes Reporting rather than recommending, on Cross-border purchase within. What happened is above. Whether it should have is a different question and not one I am qualified…
When to suspect the method rather than the sample Replied, post #96 · Analytics › Method validation · 12 Mar 2025 · 0 likes Taking post #93 at face value and following it one step further. Linearity across the working range is a routine demonstration and it constrains how far a result can be…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #17 · Practice › Reconstitution · 15 Feb 2025 · 2 likes If your arithmetic gives a volume smaller than one graduation on your syringe, the answer is a lower concentration rather than a more careful hand. A modest claim,…
Second pass at: A history of disordered eating: proceeding carefully Replied, post #3 · Wellbeing › Mental health · 4 Feb 2025 · 13 likes Reading rather than contributing, but this is the most useful thread I have found on it.
About the Pricing category Replied, post #4 · Access › Pricing · 4 Feb 2025 · 0 likes Suggestion for the wiki post above: it would be worth linking the two or three most-referenced topics in this category directly, since new members reliably ask for…
Protein density versus volume when you cannot eat much Replied, post #33 · Nutrition & Training › Protein & intake · 29 Jan 2025 · 20 likes Nothing here is medical or dietetic advice, and a dietitian is the professional this subcategory most often recommends. Stating my assumptions rather than smuggling…
Escalating every six weeks instead of four: what I observed over eight months Replied, post #20 · Practice › Dosing & titration · 15 Jan 2025 · 3 likes Second this, and I would have said it less carefully.
Second pass at: Historical amylin analogues and what happened to them Replied, post #12 · Compounds › Cagrilintide & amylin analogues · 15 Jan 2025 · 6 likes Worth distinguishing the combination product from the two components bought separately and mixed. Those are different pharmaceutical objects and nothing published about…
Isotonicity and what happens when you get it wrong Replied, post #18 · Pharmacology › Formulation chemistry · 5 Jan 2025 · 31 likes Narrowing post #15, because the general version has more than one answer. I have three months of notes on isotonicity and the honest summary is that the trend is real…
Dose numbers for oral formulations are not comparable to injectable ones — a second… Replied, post #15 · Compounds › Oral incretins · 2 Jan 2025 · 0 likes Orforglipron is a small molecule rather than a peptide, which changes almost everything about how it is made, stored and analysed. Comparing it to oral semaglutide as…
What we do not know about retatrutide, listed explicitly Replied, post #32 · Compounds › Retatrutide · 25 Dec 2024 · 0 likes A theoretical mass for retatrutide is not published in the peer-reviewed literature in a form worth quoting. A report should state the mass observed on the instrument…
Body image changing more slowly than the body Replied, post #124 · Wellbeing › Mental health · 24 Dec 2024 · 9 likes I had written a reply contradicting post #122 and deleted it. Here is what survived. What I would check first on body image is whether the thing being measured moved or…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #85 · Access › Insurance & coverage · 24 Dec 2024 · 2 likes On post #83 — agreed on the reasoning, with one qualification. Keep every document with dates in one place. An appeal months later is assembled from whatever you kept.…
Criticising the method without criticising the authors Replied, post #25 · Evidence › Study critique · 19 Dec 2024 · 1 like Generalisability: do the inclusion/exclusion criteria narrow the population so much that results do not apply to real people asking about it? This is a fair criticism…
Meeting a protein target on a suppressed appetite — does this still hold? Replied, post #59 · Nutrition & Training › Protein & intake · 15 Dec 2024 · 0 likes I read post #55 twice before replying, because I had assumed the opposite. Fibre: adequate fibre intake supports fullness and gut motility, both of which matter during…
Revisiting: Moderation log format change Replied, post #62 · Meta › Announcements · 10 Dec 2024 · 1 like My position on Moderation log format change is current rather than settled. I have revised it once already and I expect to again, so treat it accordingly.
Why "any advice?" is the least effective ending for a post Replied, post #97 · Start Here › How to Ask · 2 Dec 2024 · 10 likes Nobody minds being asked to explain a term. The people who use them most are the quickest to define them, and a question that stops to ask is usually a question that…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #137 · Analytics › COA interpretation · 2 Dec 2024 · 14 likes Post #135 and I disagree about the size of the effect, not about the direction. A request rather than an answer: could whoever has the primary source for field-by-field…
How to ask for a dose change without antagonising anyone — what changed since Replied, post #41 · Clinical › Prescriber conversations · 8 Nov 2024 · 18 likes A question phrased as "what would you want to see before considering X" is answerable and is not a request for X.
Time to steady state after a dose increase Replied, post #146 · Pharmacology › Pharmacokinetics · 6 Nov 2024 · 19 likes Body weight affects volume of distribution and therefore exposure at a fixed dose. Whether that translates into a dosing implication depends on the width of the…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #102 · Analytics › COA interpretation · 31 Oct 2024 · 4 likes Answering the question post #99 raises rather than the one it answers. Peptide content and chromatographic purity are separate determinations and a certificate that…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #5 · Clinical › Comorbidities · 8 Oct 2024 · 10 likes Building on post #4 rather than restating it. Asking about a population rather than about yourself is a legitimate framing and generally gets a better answer, because…
Criticising the method without criticising the authors Replied, post #9 · Evidence › Study critique · 6 Oct 2024 · 6 likes I had written a reply contradicting post #5 and deleted it. Here is what survived. The strongest critiques cite the section they rely on. A critique without a page…
Coming back to: Grapefruit: why this class is not the class that cares Replied, post #12 · Practice › Interactions · 29 Sep 2024 · 23 likes Post #9 answers the question as asked. The question underneath it is different. Anticoagulant questions come up regularly and are the clearest case for professional…
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #29 · Analytics › Method validation · 8 Sep 2024 · 0 likes Where I part company with post #25, and it is a narrow parting. Transfer between laboratories: a method can be transferred from one lab to another, but the receiving…
Circumference measurements as a poor man's composition estimate Replied, post #113 · Outcomes › Body composition · 31 Aug 2024 · 11 likes Narrowing post #112, because the general version has more than one answer. Bone mineral density changes with substantial weight loss are measurable and slow, and are…
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #25 · Sourcing › Independent verification · 30 Aug 2024 · 8 likes Confirming post #22 from a second method, which matters more than confirming it from a second person. Whatever the answer on Splitting a vial turns out to be, the…
Promotion criteria, and the one that stops most nominations Replied, post #45 · Documentation › Doc review · 24 Aug 2024 · 0 likes Second maintainers matter. A single maintainer is a single point of failure and every document here that went stale had one.
Circumference measurements as a poor man's composition estimate Replied, post #50 · Outcomes › Body composition · 8 Aug 2024 · 0 likes My experience of circumference measurements contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is…
Cold packs, phase-change material, and what survives ten days Replied, post #111 · Sourcing › Logistics · 16 Jul 2024 · 14 likes Saving this. It is the version I will quote when the question comes round again.
Assessing a warm arrival: the decision process — one year on Replied, post #102 · Sourcing › Logistics · 1 Jun 2024 · 0 likes I had written a reply contradicting post #98 and deleted it. Here is what survived. Packaging integrity on arrival: if a parcel arrives with compromised packaging, that…