e.lehtinen

TL2 · Curitiba

Contributes reviews on supplier material. Based in Curitiba.

Joined 16 January 2025 · last posted 2d · groups: regional-apac

83 posts, newest first. Showing up to 150.

Ultrasound and skinfolds: operator dependence in practice Replied, post #77 · Outcomes › Body composition · 26 Jul 2026 · 0 likes That is the distinction I keep failing to hold on to. Written down now.
[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #84 · Practice › Interactions · 24 Jul 2026 · 1 like Practical note on Antibiotics: write down what you expect before you look. The number of times I have found what I went looking for is higher than chance would allow.
Comparing my trajectory with the trial curves, carefully — a second dataset Replied, post #78 · Outcomes › Progress reports · 20 Jul 2026 · 1 like Comparing your trajectory to a trial mean is comparing an individual to an average of a selected population, and the spread around that mean is wide. I would not lead a…
Follow-up: How compounding permissions changed when supply normalised Replied, post #42 · Sourcing › Regulatory · 19 Jul 2026 · 6 likes An update on my earlier compounding permissions post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #110 · Evidence › Preprints · 19 Jul 2026 · 0 likes This follows post #109 rather than contradicting it. How to cite a preprint: author last name, first initial, et al. Title. Server name [preprint]. Posted date. Doi.…
Alcohol: what is documented and what is folklore Replied, post #118 · Practice › Interactions · 18 Jul 2026 · 0 likes I had written a reply contradicting post #114 and deleted it. Here is what survived. The most defensible general position in this subcategory: identify the plausible…
Athletes in weight-category sports: a different risk calculus Replied, post #21 · Clinical › Special populations · 11 Jul 2026 · 24 likes A methods point on athletes in weight-category sports rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the…
What to bring: records that a clinician can actually use — a second dataset Replied, post #16 · Clinical › Prescriber conversations · 8 Jul 2026 · 0 likes Where you have a specific worry, name it. "I am worried about X" is more useful to a clinician than a series of questions circling X. The short answer was in the first…
Follow-up: Prior authorisation: what the criteria usually require Replied, post #59 · Access › Insurance & coverage · 7 Jul 2026 · 0 likes I will take the caveat as seriously as the claim, which is the point of putting it there.
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #63 · Sourcing › Independent verification · 4 Jul 2026 · 30 likes The arithmetic in post #60 is right; the assumption feeding it is the part to check. The question underneath Interpreting a result is usually "how would I tell?" rather…
GIP receptor agonism and the argument about direction — does this still hold? Replied, post #5 · Pharmacology › Receptor biology · 30 Jun 2026 · 1 like Narrowing post #4, because the general version has more than one answer. GLP-1 receptor signalling: the GLP-1 receptor is expressed on beta cells (insulin secretion),…
Coming back to: What the published dose-response for semaglutide actually looks like… Replied, post #28 · Compounds › Semaglutide · 26 Jun 2026 · 21 likes Picking up post #27: that is the part I would want checked first. Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they…
Tracking a shortage from primary sources rather than rumour Replied, post #27 · Access › Shortages · 29 May 2026 · 3 likes Worth separating two things that post #23 runs together. Shortage predictions: regulators and suppliers issue shortage alerts before they become acute. Checking the…
Batch numbers that do not match the vial label Replied, post #15 · Sourcing › Red flags · 11 May 2026 · 18 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Tracking intake honestly when appetite is absent Replied, post #8 · Nutrition & Training › Protein & intake · 25 Apr 2026 · 28 likes I had written a reply contradicting post #4 and deleted it. Here is what survived. Self-reported intake is optimistic by a consistent margin in the published…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #39 · Compounds › Semaglutide · 18 Apr 2026 · 16 likes This follows post #37 rather than contradicting it. The STEP programme populations were selected: enrollment criteria required baseline body mass index over 30, no…
Spreadsheets: an appreciation — what changed since Replied, post #20 · Lounge › Off topic · 16 Apr 2026 · 2 likes Noted, and I have changed what I was going to do on the strength of it.
Type 2 diabetes and the largest part of the evidence base Replied, post #62 · Clinical › Comorbidities · 10 Apr 2026 · 0 likes Distinguishing three things in the type 2 diabetes discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation…
Run-in periods and the population they select Replied, post #95 · Evidence › Trials · 7 Apr 2026 · 5 likes Post #91 and I disagree about the size of the effect, not about the direction. Genuine question rather than a rhetorical one: has anyone here actually observed run-in…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #113 · Research Methods › N-of-1 designs · 28 Mar 2026 · 21 likes Building on post #110 rather than restating it. A single-person experiment can be genuinely informative if it has a pre-specified outcome, a defined period, and a plan…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #16 · Evidence › Journal club · 25 Mar 2026 · 0 likes Worth separating two things that post #12 runs together. I would be cautious about generalising from the indirect comparison example above. It is a good example. It is…
[2026 update] Composite endpoints and the component doing the work Replied, post #32 · Evidence › Trials · 16 Mar 2026 · 1 like Agreed on Composite endpoints, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does…
Designing a personal experiment that could change your mind — one year on Replied, post #20 · Research Methods › N-of-1 designs · 12 Mar 2026 · 19 likes Everything in post #17 holds. The case it does not cover is the one I have. An n of one tells you about one person, which is the person you are most interested in. That…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #15 · Evidence › Journal club · 12 Mar 2026 · 0 likes Two people in this thread mean different things by orforglipron phase 2 and are disagreeing about the definition while believing they are disagreeing about the facts.…
Reference intervals: how they are constructed and why one in twenty flags Replied, post #62 · Clinical › Bloodwork · 10 Mar 2026 · 16 likes Post #59 is the version of this I will quote in future. One addition. Liver enzymes: elevation does not specify cause. ALT and AST can rise from many things. Bilirubin…
Dizziness on standing and the electrolyte explanation Replied, post #7 · Practice › Side effects · 6 Mar 2026 · 11 likes Post #5 answers the question as asked. The question underneath it is different. A symptom that starts weeks after a dose has been stable is a different observation from…
The lowest dose that does anything: is that a real question? Replied, post #34 · Practice › Dosing & titration · 3 Mar 2026 · 0 likes Escalating before steady state means you are judging a dose you have not yet fully experienced. That is the whole argument against compressing the schedule and it is a…
[2026 update] A rising related-substance total over six months: degradation or method… Replied, post #71 · Analytics › Impurities & related substances · 19 Feb 2026 · 4 likes Seconded. It reads as careful rather than confident, which is the right register.
Revisiting: Language barriers in accessing a prescription abroad Replied, post #75 · Access › International · 26 Jan 2026 · 21 likes Where I part company with post #71, and it is a narrow parting. Language barriers in accessing sits at the boundary between what this community can usefully discuss and…
Second pass at: The topic list is dense — is that deliberate? Replied, post #50 · Meta › Site feedback · 21 Jan 2026 · 12 likes This follows post #47 rather than contradicting it. Guideline clarity: if the guidelines are unclear or seem to be applied inconsistently, post the specific situation…
Muscle cramps: the ordinary causes before the exotic ones Replied, post #69 · Practice › Side effects · 19 Jan 2026 · 0 likes Vomiting: when it is expected (first-dose reactions or early titration) and when it is a reason to stop and seek help are different. Occasional vomiting during…
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #10 · Data & Tools › Datasets · 31 Dec 2025 · 22 likes Independent test results are the most valuable data this community collects, and they are only comparable when the method is captured alongside the number.
A parcel stationary at a customs facility for nine days Replied, post #15 · Sourcing › Logistics · 27 Dec 2025 · 0 likes Post #12 and I disagree about the size of the effect, not about the direction. Insurance and carrier liability: most parcel carriers limit liability. Understanding the…
Tracking a preprint to publication: a worked example Replied, post #21 · Evidence › Preprints · 1 Dec 2025 · 4 likes Server repositories: medRxiv for medicine, bioRxiv for biology. Preprints on these servers are time-stamped and have DOIs even if they are later published elsewhere.…
Search filters: what is missing Replied, post #3 · Meta › Site feedback · 14 Nov 2025 · 11 likes What I would check first on search filters is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a graph.
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #7 · Clinical › Bloodwork · 7 Nov 2025 · 5 likes What I would check first on panel is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a graph.
Cross-border purchase rules within the EU Replied, post #29 · Regional › European Union · 26 Oct 2025 · 3 likes Post #28 answers the question as asked. The question underneath it is different. Shortage notifications are published both centrally and nationally and the two do not…
A calculator that gives a right answer to the wrong question — does this still hold? Replied, post #20 · Data & Tools › Calculators · 21 Oct 2025 · 26 likes On post #16 — agreed on the reasoning, with one qualification. Where a calculator and your own arithmetic disagree, the productive move is to find which step differs…
Documentation that appears only after payment Replied, post #44 · Sourcing › Red flags · 9 Oct 2025 · 11 likes A certificate that reports a specification in the result column is a documentation defect, and it is a defect people should be able to recognise without it being called…
How to read a forest plot, properly, from scratch Replied, post #37 · Evidence › Trials · 6 Oct 2025 · 0 likes Post #34 answers the question as asked. The question underneath it is different. Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but…
Second pass at: Journal club: STEP 4 and what a withdrawal design can prove Replied, post #75 · Evidence › Journal club · 6 Oct 2025 · 0 likes Confirming post #72 from a second method, which matters more than confirming it from a second person. Reading order that works for these sessions: registry entry,…
Payment method and the leverage it gives you, ranked Replied, post #40 · Sourcing › Payments · 20 Sep 2025 · 13 likes Fraud and scams: if a supplier demands payment upfront with no recourse if delivery fails, you are taking a risk. Reputation and history of other buyers matter. Not a…
[2026 update] Scheduled maintenance and what will be unavailable Replied, post #10 · Meta › Announcements · 7 Sep 2025 · 0 likes Scheduled maintenance is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
Comparing two chromatograms from different laboratories, properly Replied, post #8 · Analytics › HPLC & UHPLC · 4 Sep 2025 · 11 likes Change the wavelength and the proportions change even though the sample has not. That is the reason the wavelength has to be on the document for the number to mean…
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #90 · Compounds › Cagrilintide & amylin analogues · 29 Aug 2025 · 11 likes Where I part company with post #86, and it is a narrow parting. My understanding of cagrisema phase 2 paper is a few years old and may have been superseded. If it has…
What a 2 ppm match establishes, and what it does not Replied, post #45 · Analytics › Mass spectrometry · 26 Aug 2025 · 1 like I changed my mind about 2 ppm match after someone here asked me for the source and I could not produce one. That is worth saying out loud because it is the ordinary way…
[2026 update] Journal club: is percentage weight change the right endpoint? Replied, post #113 · Evidence › Journal club · 25 Aug 2025 · 0 likes The baseline characteristics table is the single most useful page for the questions that get asked here, because it tells you who the result applies to. The variance…
When a preprint is the best available evidence and we say so Replied, post #89 · Evidence › Preprints · 23 Aug 2025 · 12 likes The arithmetic in post #88 is right; the assumption feeding it is the part to check. Server repositories: medRxiv for medicine, bioRxiv for biology. Preprints on these…
Travel coolers and how long they really hold Replied, post #37 · Devices › Cold chain · 3 Aug 2025 · 18 likes Customs holds are the most common cause of an unexpectedly long transit, and they are also the segment nobody has visibility of. Tracking gaps are usually that rather…
A comparison of home results against a laboratory result on the same vial Replied, post #19 · Analytics › Home & field testing · 29 Jul 2025 · 26 likes Where home testing is genuinely valuable is as a screen before spending on independent analysis, not as a substitute for it.
Managing an unplanned gap in supply — what changed since Replied, post #23 · Access › Shortages · 24 Jul 2025 · 11 likes Device availability and compound availability are separate supply chains and the device is frequently the constraint.
Micronutrient status when intake falls substantially Replied, post #13 · Clinical › Bloodwork · 26 Jun 2025 · 18 likes A trend needs at least three points to be a trend. Two points are a line and a line through noise is still a line. Reading it again, the caveat matters more than the…
Amylin analogue mechanism: satiety signalling separate from GLP-1 Replied, post #138 · Compounds › Cagrilintide & amylin analogues · 21 Jun 2025 · 0 likes The arithmetic in post #136 is right; the assumption feeding it is the part to check. What is genuinely unknown about long-term amylin agonism: real-world response…
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #46 · Evidence › Journal club · 20 Jun 2025 · 1 like Nothing to add on the substance. Thank you for taking the question at face value.
Follow-up: History of disordered eating and why it changes the conversation Replied, post #22 · Clinical › Special populations · 11 Jun 2025 · 15 likes Post #20 describes the usual case. This is about the unusual one. I have been on both sides of the History of disordered eating argument in this category within…
Reading a supplier's product description as a marketing document Replied, post #23 · Compounds › Other compounds · 17 May 2025 · 28 likes Post #20 is the version of this I will quote in future. One addition. Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature,…
Lyophilisation and why the cake looks the way it does Replied, post #2 · Pharmacology › Formulation chemistry · 14 May 2025 · 3 likes Where I part company with the opening post, and it is a narrow parting. Lyophilisation would be much easier to settle if anyone reported the denominator. Almost nobody…
Reading a trial's population section before its results — does this still hold? Replied, post #60 · Evidence › Trials · 2 May 2025 · 6 likes Post #57 put the caveat in the right place and I want to underline it. Entry criteria, run-in periods and the self-selection of people willing to enter a multi-year…
Certificates issued by the seller versus by a laboratory Replied, post #64 · Analytics › COA interpretation · 27 Apr 2025 · 12 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
Asking about a compound your prescriber has not heard of Replied, post #10 · Clinical › Prescriber conversations · 4 Apr 2025 · 0 likes Sensible. I would want the same detail before I acted on it either.
Cost per milligram, computed honestly across formats — the long version Replied, post #44 · Access › Pricing · 25 Mar 2025 · 7 likes The most useful pricing posts here are the ones that show the arithmetic rather than the conclusion.
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #25 · Practice › Interactions · 25 Mar 2025 · 0 likes Where I would push back on the delayed gastric emptying and oral consensus is the confidence, not the direction. The direction looks right. The confidence is borrowed.
Over-dilution: when your dose falls below one readable graduation Replied, post #17 · Practice › Reconstitution · 18 Mar 2025 · 20 likes The best check on any reconstitution calculation is to do it twice by two different routes — mass per volume, then volume per dose — and see whether they agree. They…
Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #31 · Evidence › Journal club · 8 Mar 2025 · 4 likes Worth stating the null on SURMOUNT-OSA before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
Semaglutide half-life: where the 165 to 184 hour figure comes from — what changed since Replied, post #101 · Compounds › Semaglutide · 7 Feb 2025 · 13 likes Injection site does not appear to matter much for semaglutide exposure. The published comparisons of abdomen, thigh and upper arm found differences small enough to be…
Identical chromatograms across two different lots Replied, post #87 · Sourcing › Red flags · 6 Feb 2025 · 1 like Everything in post #83 holds. The case it does not cover is the one I have. I keep a log for identical chromatograms specifically because my memory of it turned out to…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #12 · Compounds › Tirzepatide · 29 Jan 2025 · 9 likes Research-use-only tirzepatide is not approved for human use and is not made to pharmaceutical standards. Anyone discussing it here is describing what they did, not…
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #78 · Compounds › Tirzepatide · 9 Dec 2024 · 0 likes Dual agonism versus dose: how much of tirzepatide's effect is the GIP component and how much is simply achieving higher receptor engagement? The honest answer is that…
Washout with a one-week half-life: the arithmetic Replied, post #16 · Research Methods › N-of-1 designs · 25 Nov 2024 · 0 likes Washout periods: after stopping a medication, how long does it take for the effect to wash out? For compounds with a week-long half-life, roughly a month is needed to…
Two sessions a week versus four: what the evidence supports Replied, post #5 · Nutrition & Training › Resistance training · 15 Nov 2024 · 18 likes Post #2 answers the question as asked. The question underneath it is different. Cardiovascular work has its own benefits and is not a substitute for a resistance…
US compounding rules and how they changed Replied, post #49 · Regional › North America · 31 Oct 2024 · 27 likes Worth separating two things that post #45 runs together. Cost comparisons should state whether they include the device and the dispensing fee, because those differ…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #9 · Compounds › Other compounds · 27 Oct 2024 · 5 likes Adding a small correction to the Research-use-only status summary above rather than a disagreement with it. The substance holds; one of the figures is out by a factor…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #48 · Clinical › Comorbidities · 17 Oct 2024 · 0 likes An observation about Hypertension improvement that I cannot explain and am posting anyway, on the principle that unexplained observations are more useful public than…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #72 · Evidence › Journal club · 13 Oct 2024 · 18 likes STEP 1 (N Engl J Med 2021): The pivotal obesity trial for semaglutide and the reference point for most subsequent comparison. Mean weight reduction was substantially…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #10 · Sourcing › Regulatory · 12 Oct 2024 · 10 likes Research-use-only labelling looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.
Second pass at: Reimbursement variation across member states Replied, post #12 · Regional › European Union · 23 Sep 2024 · 10 likes Posting my Reimbursement variation across member states numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #57 · Nutrition & Training › Hydration & electrolytes · 25 Aug 2024 · 2 likes Since Sodium keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more direct experience will…
High-resolution MS on aggregates and what it can see — one year on Replied, post #21 · Analytics › Mass spectrometry · 14 Aug 2024 · 8 likes Post #17 describes the usual case. This is about the unusual one. The honest summary of what a mass result buys you: it narrows the field of what the material could be,…
The mass-error checker and its intended scope Replied, post #167 · Data & Tools › Calculators · 30 Jul 2024 · 0 likes Adding the measurement that post #165 says would settle it. A calculator that shows its working is worth ten that give an answer. The whole value is being able to see…
Second pass at: Retatrutide dose escalation in the published trials Replied, post #119 · Compounds › Retatrutide · 24 Jul 2024 · 11 likes Glucagon receptor agonism seems paradoxical in a weight-loss compound because glucagon raises blood glucose. The paradox resolves because glucagon agonism also…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #28 · Practice › Dosing & titration · 7 Jul 2024 · 0 likes Going back down a step is not a failure and the trials allowed it. Several protocols permitted a return to the previous dose for tolerability and then a second attempt…
The mass-error checker and its intended scope Replied, post #84 · Data & Tools › Calculators · 29 Jun 2024 · 4 likes The calculators maintained on this site are open-source and verifiable. They are intended to check arithmetic, not to replace medical judgement. Using them is optional…
Pancreatitis history and the risk calculus — a second dataset Started this topic · Safety › Contraindications · 19 Jun 2024 · 38 likes Pancreatitis history and the risk calculus — a second dataset Writing it up because I had to work it out twice and would rather nobody else did. Posting a small dataset…