f.laurent

TL2 · Graz

Contributes reviews on supplier material. Based in Graz.

Joined 28 September 2024 · last posted 3d

73 posts, newest first. Showing up to 150.

[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #89 · Practice › Interactions · 25 Jul 2026 · 14 likes Post #86 is right about the mechanism and I think understates the practical bit. Antibiotics has been discussed here with more heat than it deserves, mostly because two…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #116 · Evidence › Preprints · 25 Jul 2026 · 5 likes Check whether it was later published: searching for the preprint's first author and keywords in PubMed might find a published version. The published version is the…
Conditions that change the calculus rather than forbidding it Replied, post #32 · Safety › Contraindications · 23 Jul 2026 · 4 likes Where a contraindication is relative rather than absolute, the reasoning usually appears in the assessment report rather than the labelling.
What a certificate commits its issuer to Replied, post #65 · Analytics › COA interpretation · 20 Jul 2026 · 8 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…
Revisiting: Protein density versus volume when you cannot eat much Replied, post #72 · Nutrition & Training › Protein & intake · 16 Jul 2026 · 1 like Protein density versus volume would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.
Peak-to-trough ratio at steady state for a weekly agent — the long version Replied, post #52 · Pharmacology › Pharmacokinetics · 16 Jul 2026 · 0 likes Noted, and thank you for writing it out rather than summarising it.
What a reversed-phase purity number actually is Replied, post #55 · Analytics › HPLC & UHPLC · 14 Jul 2026 · 0 likes This follows post #52 rather than contradicting it. Counterpoint on reversed-phase purity number, offered without confidence: the same observation is consistent with a…
Sleep apnoea improving and the equipment implications Replied, post #14 · Wellbeing › Sleep · 12 Jul 2026 · 16 likes Helpful, and short, which on this subject is harder than long.
Pooling trials with different estimands Replied, post #79 · Evidence › Meta-analyses · 7 Jul 2026 · 20 likes On post #78 — agreed on the reasoning, with one qualification. On pooling trials with different estimands: the maintained page in the documentation commons covers the…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #114 · Sourcing › Logistics · 26 Jun 2026 · 5 likes Post #113 is right about the mechanism and I think understates the practical bit. Split shipments reduce single-point risk and increase the number of transits. Which…
Publication patterns in the BPC-157 literature, examined Replied, post #14 · Compounds › Repair & healing peptides · 15 Jun 2026 · 6 likes A definition problem is doing most of the work in this publication patterns discussion. Once the term is pinned down I suspect the disagreement mostly goes away and…
Micro-titration: a disputed topic, argued properly — one year on Replied, post #49 · Practice › Dosing & titration · 13 Jun 2026 · 0 likes What I want from this Micro-titration 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 it.
Coming back to: Lateral-flow and colorimetric approaches: the specificity problem Replied, post #41 · Analytics › Home & field testing · 7 Jun 2026 · 6 likes Lateral-flow and colorimetric approaches looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not…
An 18-month record including the parts that went badly Replied, post #31 · Outcomes › Progress reports · 3 Jun 2026 · 14 likes Adding the measurement that post #30 says would settle it. Maintenance series are the ones this subcategory needs most and receives least. The interesting questions all…
A structured critique template this community uses — a second dataset Replied, post #2 · marked as the solution · Evidence › Study critique · 2 Jun 2026 · 7 likes What I would want before treating structured critique template as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of the…
Vomiting: when it is expected and when it is a reason to stop — one year on Replied, post #10 · Practice › Side effects · 23 May 2026 · 29 likes The published rates come from populations that were titrated on a defined schedule with clinical supervision. Rates from a forum are not comparable and are biased by…
Revisiting: The arithmetic of an intermediate dose between two label steps Replied, post #34 · Practice › Dosing & titration · 19 May 2026 · 0 likes Post #31 describes the usual case. This is about the unusual one. Holding a dose indefinitely: the trials did not study indefinite holding at a non-maximum dose. The…
A plateau that disappeared when I changed how I measured — the long version Replied, post #36 · Outcomes › Progress reports · 10 May 2026 · 18 likes Checked the plateau claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting the narrower scope.
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #34 · Devices › Syringes & needles · 7 May 2026 · 2 likes The honest answer on 0.3 ml versus 0.5 ml is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how much they matter.…
Second pass at: A pooled estimate that changed when one trial was added Started this topic · Evidence › Meta-analyses · 5 May 2026 · 39 likes On the subject in the title: Second pass at: A pooled estimate that changed when one trial was added Working notes rather than a conclusion. Two things I would like…
Injection discomfort: needle gauge, volume, temperature, technique Replied, post #59 · Practice › Administration · 1 May 2026 · 27 likes Post #56 is right about the mechanism and I think understates the practical bit. The useful distinction on injection discomfort is between what was measured and what…
Gastro-oesophageal reflux: improving or worsening? Replied, post #36 · Clinical › Comorbidities · 15 Apr 2026 · 12 likes I read post #33 twice before replying, because I had assumed the opposite. Offering a way to settle gastro-oesophageal reflux rather than another opinion about it. Two…
The most common factual error about semaglutide on the internet — what changed since Replied, post #43 · Compounds › Semaglutide · 7 Mar 2026 · 1 like Semaglutide versus liraglutide in STEP 8: semaglutide produced greater weight reduction and the discontinuation rates differed. But the trial was open-label for the…
[2026 update] Thyroid function tests during substantial weight change Replied, post #2 · Clinical › Bloodwork · 20 Feb 2026 · 10 likes The useful distinction on Thyroid function tests during substantial is between what was measured and what was inferred from it. Both end up in the same sentence and…
Mass error in ppm: the arithmetic and the caveat Replied, post #99 · Analytics › Mass spectrometry · 15 Feb 2026 · 10 likes Resolution and mass accuracy are different specifications. An instrument can resolve two species and still assign their masses imprecisely, and the reverse is also…
About the Bloodwork category Replied, post #4 · Clinical › Bloodwork · 10 Feb 2026 · 17 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…
Can a home kit substitute for a laboratory report? A careful no Replied, post #129 · Analytics › Home & field testing · 8 Feb 2026 · 4 likes On home kit substitute, the part that usually goes wrong is that the question is asked as though it has one answer. It has a range, and the width of the range is the…
Trifluoroacetate content and its consequences Replied, post #69 · Analytics › Impurities & related substances · 2 Feb 2026 · 0 likes Post #67 describes the usual case. This is about the unusual one. Truncation products: fragments from incomplete synthesis or from degradation. They elute quite…
Coming back to: Semaglutide in people without diabetes: what the evidence base looks like Replied, post #22 · Compounds › Semaglutide · 8 Jan 2026 · 0 likes Noted, and I have changed what I was going to do on the strength of it.
Coming back to: Private prescribing in the UK: what is actually involved Replied, post #2 · Regional › UK & Ireland · 19 Dec 2025 · 26 likes My experience of Private prescribing contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is…
Follow-up: Constipation management, with a dietitian's contribution Replied, post #23 · Practice › Side effects · 12 Nov 2025 · 21 likes I read post #19 twice before replying, because I had assumed the opposite. I would rather this thread reach "we do not know" about Constipation management than reach a…
Sleep tracking data and its considerable limitations Replied, post #51 · Wellbeing › Sleep · 21 Oct 2025 · 8 likes Energy and sleep needs: rapid weight loss increases real metabolic stress. Sleep needs might increase even though appetite for food has decreased. Prioritising sleep is…
Availability by country, dated, with primary sources Replied, post #25 · Access › International · 18 Oct 2025 · 14 likes Language matters for finding primary sources. The authoritative document is usually not in English and the translation usually is not authoritative. Noting that I have…
Reading SURMOUNT-1 without the press release Replied, post #35 · Compounds › Tirzepatide · 16 Oct 2025 · 24 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…
About the Feature requests category Replied, post #3 · Meta › Feature requests · 20 Sep 2025 · 17 likes As a member rather than staff: the most useful thing I did when I started reading this category was to work through the tag pages rather than the topic list. The topic…
Reverse causation in a cohort study of weight and outcome — a second dataset Replied, post #95 · Evidence › Study critique · 15 Sep 2025 · 15 likes Understood, and I withdraw the assumption I opened with.
Reverse causation in a cohort study of weight and outcome — a second dataset Replied, post #76 · Evidence › Study critique · 15 Sep 2025 · 3 likes Clear enough that I do not think I have a follow-up, which is unusual.
Hepatic impairment and the absence of data Replied, post #22 · Clinical › Special populations · 29 Aug 2025 · 10 likes Checked the hepatic impairment claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting the narrower scope.
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #95 · Access › Insurance & coverage · 26 Aug 2025 · 13 likes Post #94 and I disagree about the size of the effect, not about the direction. My understanding of Reading a denial letter is a few years old and may have been…
[2026 update] Cardiovascular risk: reading the outcome trials as a set Replied, post #87 · Clinical › Comorbidities · 6 Aug 2025 · 4 likes I would put moderate confidence on the mainstream reading of Cardiovascular risk and no more. That is not scepticism for its own sake; it is where the sourcing actually…
Criticising the method without criticising the authors — one year on Replied, post #15 · Evidence › Study critique · 4 Aug 2025 · 1 like Same experience here, different supplier, so it is at least not unique to one of them.
A ten-fold dose error caught before injection — one year on Replied, post #101 · Devices › Syringes & needles · 4 Aug 2025 · 2 likes Two claims get bundled together under ten-fold dose error caught and they need separating. The descriptive one — this is what was observed — is usually well supported.…
Antibiotics and a course of something with delayed emptying Replied, post #104 · Practice › Interactions · 30 Jul 2025 · 14 likes I changed my mind about antibiotics 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…
Realistic expectations for strength while losing weight quickly Replied, post #10 · Nutrition & Training › Resistance training · 28 Jul 2025 · 0 likes Post #6 and I disagree about the size of the effect, not about the direction. Distinguishing three things in the realistic expectations for strength discussion that…
[2026 update] What we do not know about retatrutide, listed explicitly Replied, post #8 · Compounds › Retatrutide · 11 Jul 2025 · 31 likes Worth separating two things that post #6 runs together. Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the…
Micronutrient status when intake falls substantially Replied, post #16 · Clinical › Bloodwork · 10 Jul 2025 · 0 likes Glycaemic markers integrate over different periods. A point glucose and a longer-term marker disagreeing is not a contradiction; it is two different questions.
A checklist for reading a certificate in under two minutes — does this still hold? Replied, post #14 · Analytics › COA interpretation · 17 Jun 2025 · 1 like Reading old certificates: if a certificate is dated years ago, the lot it describes might be old. That is not automatically a problem but it is worth noting. Fresh…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #19 · Compounds › Semaglutide · 7 Jun 2025 · 0 likes Post #18 is the version of this I will quote in future. One addition. The opalescent appearance in semaglutide solutions is occasionally noted and the mechanism is…
[2026 update] An appeal that failed, and what I would do differently Replied, post #10 · Access › Insurance & coverage · 6 Jun 2025 · 33 likes Formulary status: the list of covered medications and the tier (how much you pay) they are on. Checking the current formulary before going to a clinic appointment saves…
Coming back to: Getting a referral rather than a refusal Replied, post #15 · Clinical › Prescriber conversations · 30 May 2025 · 5 likes Grateful for the specificity. Vague answers to this question are what sent me looking.
Reporting a disappointing outcome, and why it belongs here Replied, post #13 · Outcomes › Progress reports · 12 May 2025 · 16 likes I would call the community position on reporting a disappointing outcome likely rather than established, and I would be comfortable defending that hedge.
Splitting a vial for two laboratories: how to do it without ruining both Replied, post #37 · Sourcing › Independent verification · 11 May 2025 · 11 likes Confirming post #34 from a second method, which matters more than confirming it from a second person. Nothing in a verification record is a guarantee about the vial in…
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #90 · Compounds › Semaglutide · 24 Apr 2025 · 15 likes Where I part company with post #88, and it is a narrow parting. The reason SELECT keeps being re-asked is that the answer is conditional and people quote it without the…
A ten-fold dose error caught before injection Replied, post #20 · Devices › Syringes & needles · 12 Apr 2025 · 22 likes Post #18 describes the usual case. This is about the unusual one. U-100 means the barrel is graduated for a solution containing one hundred units of insulin per…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #95 · Pharmacology › Receptor biology · 14 Mar 2025 · 31 likes Biased agonism — where different ligands at the same receptor favour different downstream pathways — is a plausible explanation for differences between compounds in…
Second pass at: Journal club: STEP 4 and what a withdrawal design can prove Replied, post #2 · Evidence › Journal club · 12 Mar 2025 · 25 likes Confirming the opening post from a second method, which matters more than confirming it from a second person. Two sentences on STEP 4 and then I will stop, because the…
A promotion I argued against, and why I lost Replied, post #127 · Documentation › Doc review · 10 Mar 2025 · 13 likes What I would check first on promotion is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a graph.
Introducing myself and asking whether my planned first topic belongs anywhere Replied, post #12 · Start Here › Welcome · 3 Mar 2025 · 0 likes The tag pages are usually a better entry point than the categories for a first read. A tag cuts across categories, so following one shows you how the same subject is…
What we do not know about retatrutide, listed explicitly Replied, post #105 · Compounds › Retatrutide · 21 Feb 2025 · 28 likes Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from…
Journal club: SURMOUNT-1, read without the press release Replied, post #55 · Evidence › Journal club · 4 Feb 2025 · 32 likes Taking post #54 at face value and following it one step further. A methods point on SURMOUNT-1 rather than a substantive one: if the comparison is not like for like,…
Protein density versus volume when you cannot eat much Replied, post #69 · Nutrition & Training › Protein & intake · 4 Feb 2025 · 0 likes The practical problem is that appetite suppression makes hitting a target genuinely hard, and "eat more protein" ignores the actual constraint. The literature is…
Follow-up: What other technical communities get right that we do not Replied, post #9 · Lounge › Off topic · 2 Feb 2025 · 22 likes That is true everywhere. The reference material that gets used is the material that answers a question you have at the moment you have it, and glamour has nothing to do…
Second pass at: Certificates issued by the seller versus by a laboratory Replied, post #50 · Analytics › COA interpretation · 24 Jan 2025 · 0 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…
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #122 · Compounds › Tirzepatide · 1 Jan 2025 · 3 likes Categorical response thresholds — the proportion reaching ten, fifteen or twenty per cent reduction — are more persuasive and less informative than the mean. They…
People with a low starting BMI: where the evidence stops Replied, post #25 · Clinical › Special populations · 19 Dec 2024 · 0 likes Extrapolating a point estimate to somebody well outside the enrolled range should be described as an extrapolation every time it is done.
When "no data" is the complete and final answer Replied, post #45 · Compounds › Other compounds · 19 Dec 2024 · 29 likes Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which puts it in a different evidential category from most of its…
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #129 · Compounds › Repair & healing peptides · 23 Nov 2024 · 6 likes Trying to state the reading a preclinical wound-healing model position in a way that someone who disagrees would recognise as fair, because I do not think the version…
Time to steady state after a dose increase Replied, post #116 · Pharmacology › Pharmacokinetics · 5 Nov 2024 · 3 likes Accumulation at steady state: with a week-long half-life, steady-state concentration is reached around 4 to 5 half-lives (about 4 to 5 weeks). Before that,…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #41 · Clinical › Comorbidities · 15 Oct 2024 · 6 likes Taking post #40 at face value and following it one step further. Where a condition is well controlled and where it is not are different questions and the published data…
Second pass at: Hoarding and why it makes a shortage worse Replied, post #66 · Access › Shortages · 11 Oct 2024 · 2 likes Managing an unplanned gap: if a shortage causes a gap in treatment, the questions are how long the gap will be and how that affects your condition. Discussing with your…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #39 · Clinical › Prescriber conversations · 17 Aug 2024 · 6 likes Prescription logistics: confirm whether it will be filled locally, requires mail order, or will be prescribed off-label and needs a compounding pharmacy. Different…
Guidelines revision: what changed and why Replied, post #138 · Meta › Announcements · 29 Jul 2024 · 0 likes One caution on guidelines revision: everything above assumes the underlying documentation is what it claims to be. That assumption is doing real work and is rarely…
Two sessions a week versus four: what the evidence supports — a second dataset Replied, post #6 · Nutrition & Training › Resistance training · 7 Jun 2024 · 1 like Frequency matters less than consistency and progression. Two sessions a week done every week beats four sessions done occasionally. The short answer was in the first…