o.lindgren

TL2 Regular · Uppsala, SE

Compares vendor documentation across suppliers for the directory pages. Mostly a spreadsheet person.

Joined 23 October 2024 · last posted 5d · groups: wiki-editors

77 posts, newest first. Showing up to 150.

Aggregate verification data across the directory, with caveats Replied, post #66 · Sourcing › Independent verification · 23 Jul 2026 · 2 likes Verification records are dated because they expire in usefulness. A result from two years ago describes a lot from two years ago. That is the practical version. The…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #100 · Analytics › Impurities & related substances · 21 Jul 2026 · 0 likes Comparing impurity profiles across suppliers is much more informative than comparing purity figures, and almost nobody has the documents to do it. I have separated what…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #107 · Sourcing › Independent verification · 20 Jul 2026 · 7 likes A supplier that supplies a supplementary certificate for a lot released a year ago has demonstrated that its records exist and are retrievable. That is a real property.
Substitution between formats during a shortage — what changed since Replied, post #20 · Access › Shortages · 18 Jul 2026 · 31 likes That matches what I have seen, for whatever a single anecdote is worth.
Request: a per-category review queue Replied, post #110 · Meta › Feature requests · 17 Jul 2026 · 30 likes Tradeoffs: every feature has a cost in maintenance and complexity. Acknowledging tradeoffs shows you have thought through the implications.
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #75 · Evidence › Journal club · 17 Jul 2026 · 7 likes Post #73 put the caveat in the right place and I want to underline it. Where the SUSTAIN 6 discussion usually stalls is that nobody wants to say "I do not know" and…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #115 · Evidence › Journal club · 12 Jul 2026 · 4 likes Reading order that works for these sessions: registry entry, methods, baseline table, primary result, then abstract last. Reading the abstract first anchors everything…
Common supplements people ask about, assessed one at a time Replied, post #28 · Practice › Interactions · 10 Jul 2026 · 12 likes Metformin: commonly co-administered and relevant to gastrointestinal tolerability. Gastrointestinal side effects can overlap and additive. Taking them separately or…
Stepping down deliberately, and how to do it without losing progress — what changed since Replied, post #49 · Practice › Dosing & titration · 9 Jul 2026 · 27 likes Concentration and dose get conflated constantly in this subcategory. Changing how much diluent you add changes the volume you draw and changes nothing about the dose.
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #82 · Analytics › Method validation · 8 Jul 2026 · 1 like System suitability: injections run at the start of a batch to establish that the instrument and column are performing. Acceptance criteria typically include replicate…
Aggregate verification data across the directory, with caveats Replied, post #26 · Sourcing › Independent verification · 3 Jul 2026 · 2 likes Nothing in a verification record is a guarantee about the vial in your hand. That check is yours and nobody can do it for you. I would be interested in a counterexample…
What I would want from a home test that does not exist yet — what changed since Replied, post #72 · Analytics › Home & field testing · 28 Jun 2026 · 4 likes Ultraviolet absorbance at 280 nanometres estimates concentration for peptides containing aromatic residues and gives nothing for peptides that do not. Knowing which…
Rewriting my first post: a before-and-after, with commentary — what changed since Replied, post #9 · Start Here › How to Ask · 21 Jun 2026 · 1 like This follows post #8 rather than contradicting it. A question about somebody else's post should be a reply to that post, not a new topic. A question the post happened…
Alcohol: what is documented and what is folklore Replied, post #66 · Practice › Interactions · 19 Jun 2026 · 15 likes Alcohol is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
The anatomy of a question that gets answered within an hour Replied, post #83 · Start Here › How to Ask · 19 Jun 2026 · 3 likes Where I part company with post #81, and it is a narrow parting. Questions you cannot explain: "I cannot say why I am asking this, but is this compound stable at room…
Second pass at: Metformin co-administration and additive GI effects Replied, post #118 · Practice › Interactions · 3 Jun 2026 · 16 likes I read post #116 twice before replying, because I had assumed the opposite. A note on scope: what I am saying about Metformin co-administration applies to the case in…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #49 · Practice › Administration · 2 Jun 2026 · 7 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Does a peptide degrade silently, with no visual change? Replied, post #38 · Practice › Storage & stability · 31 May 2026 · 28 likes The claim about peptide upthread is stronger than its source supports. I have read the source. The source says "associated with" and the post says "causes".
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #56 · Evidence › Preprints · 18 May 2026 · 25 likes A preprint with the data and code attached is frequently more checkable than a published paper without them. Reviewed and reproducible are different properties.
Revisiting: PCOS and metabolic overlap: what is and is not studied Replied, post #28 · Clinical › Comorbidities · 15 May 2026 · 0 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.
Follow-up: Search filters: what is missing Replied, post #102 · Meta › Site feedback · 15 May 2026 · 0 likes Worth stating the null on Search filters before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
Run-in periods and the population they select Replied, post #108 · Evidence › Trials · 29 Apr 2026 · 0 likes Confirming post #107 from a second method, which matters more than confirming it from a second person. Absolute numbers, not just relative: a 30% relative reduction…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #88 · Research Methods › Statistics · 26 Apr 2026 · 31 likes Post #84 describes the usual case. This is about the unusual one. Effect sizes: the magnitude of a difference, not just whether it is statistically significant. A…
Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #108 · Analytics › Mass spectrometry · 14 Apr 2026 · 0 likes Post #107 answers the question as asked. The question underneath it is different. The honest summary of what a mass result buys you: it narrows the field of what the…
Prescription requirements and telehealth models — a second dataset Replied, post #2 · Sourcing › Regulatory · 12 Apr 2026 · 11 likes Second-hand on Prescription requirements and telehealth models, so weight it accordingly — someone whose method I trust told me this and I have not verified it myself.
Revisiting: Theoretical plates: useful number or ritual? Started this topic · Analytics › HPLC & UHPLC · 29 Mar 2026 · 12 likes Asking directly, because I could not find a straight answer: Revisiting: Theoretical plates: useful number or ritual? Asking about Theoretical plates directly, because…
Liver enzymes drifting down and what that usually means Replied, post #70 · Clinical › Bloodwork · 25 Mar 2026 · 0 likes That is the distinction I keep failing to hold on to. Written down now.
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset Replied, post #33 · Sourcing › Independent verification · 20 Mar 2026 · 19 likes PeptideMeter: purity analysis plus structured, dated supplier verification records. Produces both individual analytical results and verification records assessed over…
Type 2 diabetes and the largest part of the evidence base Replied, post #35 · Clinical › Comorbidities · 18 Mar 2026 · 4 likes Two questions I would want answered before drawing anything from the type 2 diabetes data above: how were the cases selected, and what happened to the ones that dropped…
The anatomy of a question that gets answered within an hour Started this topic · Start Here › How to Ask · 17 Mar 2026 · 6 likes The anatomy of a question that gets answered within an hour — setting out what I have, and where I think it stops being reliable. Question in the title. Context below,…
Journal club: STEP 8 and the fairness of the comparator dose — a second dataset Started this topic · Evidence › Journal club · 6 Mar 2026 · 12 likes Posting this under the heading it deserves: Journal club: STEP 8 and the fairness of the comparator dose — a second dataset Everything below is what sits behind that.…
A site rotation scheme that is easy enough to actually follow Replied, post #12 · Practice › Administration · 28 Feb 2026 · 10 likes Building on post #11 rather than restating it. Pinching a fold is useful for lean tissue and unnecessary elsewhere. The point is to keep the needle out of muscle, and…
Second pass at: Where impurities in solid-phase peptide synthesis come from Replied, post #27 · Analytics › Impurities & related substances · 23 Feb 2026 · 0 likes This follows post #26 rather than contradicting it. Aggregates may be a multiple of the monomer mass and may not elute at all under a standard method. What does not…
Interpreting a result that disagrees with the supplier's certificate Replied, post #105 · Sourcing › Independent verification · 2 Feb 2026 · 6 likes Small methodological point on interpreting a result: repeating a measurement is cheap and resolves most of what is being argued about here at no cost to anyone.
Search filters: what is missing Replied, post #19 · Meta › Site feedback · 19 Jan 2026 · 0 likes Small methodological point on search filters: repeating a measurement is cheap and resolves most of what is being argued about here at no cost to anyone.
Follow-up: A supplier that answers analytical questions with restated claims Replied, post #41 · Sourcing › Red flags · 7 Jan 2026 · 2 likes Adding what did not work for me on supplier, since the failures never get written up and they are half the useful information.
Vomiting: when it is expected and when it is a reason to stop Replied, post #71 · Practice › Side effects · 28 Dec 2025 · 1 like Post #67 describes the usual case. This is about the unusual one. The relationship between symptom burden and outcome is not what people assume. Feeling worse is not…
Can a home kit substitute for a laboratory report? A careful no Replied, post #87 · Analytics › Home & field testing · 24 Dec 2025 · 18 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — the long… Replied, post #3 · Compounds › Tirzepatide · 28 Nov 2025 · 32 likes This follows the opening post rather than contradicting it. Storage and stability: published data on licensed tirzepatide formulations exists and is worth reading…
Dead volume across syringe and needle combinations Replied, post #29 · Devices › Syringes & needles · 25 Nov 2025 · 19 likes A detachable luer needle plus hub can retain enough volume to matter. Whether it matters to you depends on your dose, and the arithmetic is worth doing once.
Pooling trials with different estimands — what changed since Replied, post #54 · Evidence › Meta-analyses · 21 Nov 2025 · 12 likes I disagree with the framing of Pooling trials with different estimands above, and I think it is a substantive disagreement rather than a terminological one. Setting out…
Robustness: the parameters worth deliberately varying Replied, post #5 · Analytics › Method validation · 17 Nov 2025 · 25 likes Coming back to the opening post, because the follow-up matters more than the original answer. Genuine question rather than a rhetorical one: has anyone here actually…
Revisiting: Aggregates and why a purity assay may miss them entirely Replied, post #3 · Analytics › Impurities & related substances · 12 Nov 2025 · 9 likes Adding the measurement that the opening post says would settle it. Aggregates is a question about a distribution, not about a value, and treating it as a value is what…
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #150 · Practice › Reconstitution · 22 Oct 2025 · 0 likes On post #148 — agreed on the reasoning, with one qualification. Write the reconstitution date and the concentration on the vial. Not on a note, on the vial. Every…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #32 · Compounds › Cagrilintide & amylin analogues · 2 Oct 2025 · 22 likes Where I part company with post #28, and it is a narrow parting. Cagrilintide alone is discussed less than in combination because the published data is almost entirely…
Second pass at: Two scans six weeks apart on different machines: a cautionary tale Replied, post #4 · Outcomes › Body composition · 26 Sep 2025 · 0 likes Building on the opening post rather than restating it. Two scans six months apart on one machine tell you something. Two scans six weeks apart on different machines…
Pinch or no pinch, and how needle length changes the answer Replied, post #31 · Practice › Administration · 24 Aug 2025 · 0 likes Post #28 answers the question as asked. The question underneath it is different. Small methodological point on pinch: repeating a measurement is cheap and resolves most…
Second pass at: The mass-error checker and its intended scope Replied, post #2 · Data & Tools › Calculators · 16 Aug 2025 · 7 likes The opening post and I disagree about the size of the effect, not about the direction. A definition problem is doing most of the work in this mass-error checker…
A ten-fold dose error caught before injection — one year on Replied, post #97 · Devices › Syringes & needles · 3 Aug 2025 · 11 likes Sharps containers are a legal requirement for disposal in several jurisdictions and a sensible precaution everywhere. A rigid sealed container is the minimum.
Coming back to: Sample size calculations, read backwards from the published number Replied, post #62 · Evidence › Trials · 25 Jul 2025 · 4 likes Adding a reference point for Sample size calculations. Mine is a single case, collected without controls, and I am posting the method alongside it so it can be…
Escalating every six weeks instead of four: what I observed over eight months — one year… Replied, post #40 · Practice › Dosing & titration · 9 Jul 2025 · 18 likes The useful distinction on Escalating every six weeks instead is between what was measured and what was inferred from it. Both end up in the same sentence and only one…
Request: a diff view for wiki revisions — the long version Replied, post #15 · Meta › Feature requests · 3 Jul 2025 · 24 likes Deprecation requests: if you think a feature should be removed or changed, that is also a request. Explain why you think it would improve the site.
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #64 · Evidence › Journal club · 3 Jul 2025 · 8 likes Somebody should be asked to argue the paper's case even if nobody in the room believes it. Sessions where everyone agrees produce a summary nobody can use. Speaking for…
Why oral semaglutide needs an absorption enhancer at all Replied, post #15 · Compounds › Oral incretins · 29 Jun 2025 · 6 likes Narrowing post #14, because the general version has more than one answer. Oral versus injectable exposure: comparing a 14 mg oral dose with a 0.5 mg injectable dose is…
What this community means by "a source", in practical terms Replied, post #14 · Start Here › Welcome · 24 Jun 2025 · 2 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…
[2026 update] An appeal that failed, and what I would do differently Replied, post #150 · Access › Insurance & coverage · 16 Jun 2025 · 0 likes Posting my appeal numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who wanted a particular answer.
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #65 · Compounds › Retatrutide · 15 Jun 2025 · 0 likes The failure mode on Triple agonism is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple to get wrong.
Coming back to: Getting a referral rather than a refusal Replied, post #28 · Clinical › Prescriber conversations · 3 Jun 2025 · 0 likes I would keep Getting a referral and the decision it usually gets used for separate in this thread. They are related and they are not the same question, and merging them…
Follow-up: The lowest dose that does anything: is that a real question? Replied, post #11 · Practice › Dosing & titration · 7 May 2025 · 0 likes How the published trials escalated: they used specific step sizes and intervals. The STEP programme used a particular cadence; the SURPASS and SURMOUNT programmes used…
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #116 · Compounds › Semaglutide · 25 Mar 2025 · 1 like The 165 to 184 hour half-life range gets quoted as a fixed number. It is a range across a studied population, and individual clearance varies enough that a person's own…
Why a pen's dose steps are fixed and what that costs you — one year on Replied, post #6 · Devices › Pens & autoinjectors · 22 Mar 2025 · 13 likes Post #4 and I disagree about the size of the effect, not about the direction. Storage after first use: most pens can be stored at room temperature after first use, even…
Coverage for the indication versus for the drug — a second dataset Replied, post #29 · Access › Insurance & coverage · 20 Mar 2025 · 2 likes Adding what did not work for me on Coverage, since the failures never get written up and they are half the useful information.
Second pass at: Albumin binding and how it produces a long half-life Replied, post #12 · Pharmacology › Pharmacokinetics · 4 Mar 2025 · 28 likes Adding a data point of agreement rather than a data point.
Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #17 · Evidence › Journal club · 28 Feb 2025 · 12 likes Adding a null result on SURMOUNT-OSA. I looked, carefully, and found nothing, and null results deserve posting precisely because they never are.
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #55 · Compounds › Semaglutide · 8 Feb 2025 · 0 likes Semaglutide's structure is a modified backbone with a C18 diacid attached through a spacer. The acylation is the reason for the long half-life and it is also the reason…
Second pass at: Certificates issued by the seller versus by a laboratory Replied, post #29 · Analytics › COA interpretation · 20 Jan 2025 · 24 likes Helpful, and short, which on this subject is harder than long.
Follow-up: Individual participant data versus aggregate data Replied, post #23 · Evidence › Meta-analyses · 8 Jan 2025 · 7 likes Post #19 put the caveat in the right place and I want to underline it. Study quality and weighting: some meta-analyses weight all studies equally; others weight by…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #107 · Compounds › Oral incretins · 28 Dec 2024 · 0 likes Post #106 is right about the mechanism and I think understates the practical bit. SNAC is the sodium N-(8-[2-hydroxybenzoyl]amino) caprylate, an absorption enhancer…
Second pass at: Choosing a concentration on purpose rather than by accident Replied, post #33 · Practice › Reconstitution · 2 Dec 2024 · 0 likes Choosing a concentration on purpose rather than by accident: starting with "I want to draw 0.5 mL per dose" and working backward to the required concentration is more…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #111 · Clinical › Prescriber conversations · 29 Nov 2024 · 0 likes Post #108 is right about the mechanism and I think understates the practical bit. A question phrased as "what would you want to see before considering X" is answerable…
How to ask for a dose change without antagonising anyone — what changed since Replied, post #79 · Clinical › Prescriber conversations · 19 Nov 2024 · 14 likes I had written a reply contradicting post #75 and deleted it. Here is what survived. The most useful question anyone here has reported asking: what would make you change…
Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #100 · Practice › Dosing & titration · 8 Nov 2024 · 31 likes A note on scope: what I am saying about four-week escalation interval applies to the case in the first post and I would not extend it further without checking.
Choosing which test to pay for, given a fixed budget — does this still hold? Replied, post #8 · Sourcing › Independent verification · 24 Oct 2024 · 11 likes A record with four results over sixteen months is a thin record rather than a bad one, and the honest description says which. I would want to see it done twice before…
Irish differences from the UK position Replied, post #2 · marked as the solution · Regional › UK & Ireland · 19 Sep 2024 · 7 likes Practical answer on irish differences, since the theoretical one is upthread: do the simplest check first, write down the result, and only then decide whether the…
Follow-up: Oral contraceptives and delayed emptying: what the data shows Replied, post #6 · Practice › Interactions · 15 Jul 2024 · 0 likes The practical advice most consistently given by pharmacists here is to keep the timing of other oral medication consistent rather than to change it, because consistency…
Two sessions a week versus four: what the evidence supports — a second dataset Replied, post #25 · Nutrition & Training › Resistance training · 5 Jul 2024 · 16 likes Post #23 describes the usual case. This is about the unusual one. Nothing here is medical advice and anybody with a relevant condition should have a programme reviewed…
Assessing a warm arrival: the decision process — one year on Replied, post #51 · Sourcing › Logistics · 30 May 2024 · 0 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.