e.kjeldsen

TL2 Member · Odense, DK

Practical questions, practical answers. Not interested in speculation without a source.

Joined 17 March 2025 · last posted 2d

74 posts, newest first. Showing up to 150.

Distinguishing a red flag from an inconvenience — a second dataset Replied, post #12 · Sourcing › Red flags · 26 Jul 2026 · 22 likes A stock listing that never changes and a lead time that never varies are both worth noticing. Real operations have variation in them. I am aware this is the third time…
How much context is too much context in a first post? Replied, post #56 · Start Here › How to Ask · 9 Jul 2026 · 0 likes What you have already read matters. Saying "I read the maintained page on this and I still have a gap" tells people they do not need to point you at the same resource…
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #13 · Analytics › HPLC & UHPLC · 5 Jul 2026 · 2 likes Adding a data point of agreement rather than a data point.
Primary endpoint hierarchies and why order matters — one year on Replied, post #33 · Evidence › Trials · 2 Jul 2026 · 0 likes A trial that answers a slightly different question from the one you have is the normal situation rather than a failure of the trial. The skill is describing the gap…
What TRIUMPH is designed to answer, and why we should not pre-empt it Replied, post #5 · Compounds › Retatrutide · 1 Jul 2026 · 3 likes Dose-response in the phase 2 obesity work was clear across the studied range, with no obvious plateau within it. Extrapolating beyond the highest studied dose from that…
What TRIUMPH is designed to answer, and why we should not pre-empt it — does this still… Replied, post #38 · Compounds › Retatrutide · 29 Jun 2026 · 0 likes The arithmetic in post #36 is right; the assumption feeding it is the part to check. Triple agonism: is the effect additive, synergistic, or neither? A phase 2…
Follow-up: Signs of dehydration worth acting on Replied, post #8 · Safety › Adverse events · 28 Jun 2026 · 10 likes Signs of dehydration worth acting would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.
Molecular mass of semaglutide and why the figure differs between sources Replied, post #87 · Compounds › Semaglutide · 26 Jun 2026 · 0 likes Reading back through the molecular mass of semaglutide threads from last year, the same three questions come up every time and only one of them has ever been answered…
Aggregate verification data across the directory, with caveats Replied, post #13 · Sourcing › Independent verification · 25 Jun 2026 · 11 likes Interpreting a result: a purity figure is one measurement on one vial on one day. Agreement across two services is much stronger. A single high number does not…
Lean mass preservation: what the evidence supports — does this still hold? Replied, post #102 · Outcomes › Body composition · 25 Jun 2026 · 0 likes The useful distinction on Lean mass preservation is between what was measured and what was inferred from it. Both end up in the same sentence and only one of them has…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #23 · Sourcing › Independent verification · 17 Jun 2026 · 0 likes Adding a data point of agreement rather than a data point.
Endotoxin and why it is a separate question from purity — what changed since Replied, post #46 · Analytics › Impurities & related substances · 14 Jun 2026 · 0 likes Deamidation at asparagine or glutamine adds approximately one dalton and frequently produces a close-eluting pair. It is the impurity most likely to be integrated into…
Second pass at: A pooled estimate that changed when one trial was added Replied, post #28 · Evidence › Meta-analyses · 12 Jun 2026 · 13 likes Two claims get bundled together under pooled estimate and they need separating. The descriptive one — this is what was observed — is usually well supported. The causal…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #33 · Analytics › Method validation · 26 May 2026 · 0 likes On post #29 — agreed on the reasoning, with one qualification. Specificity looks different depending on whether you are reading the primary literature or the summaries…
[2026 update] Thyroid function tests during substantial weight change Replied, post #65 · Clinical › Bloodwork · 12 May 2026 · 9 likes Post #61 describes the usual case. This is about the unusual one. Biological variation: the person-to-person variation in a biomarker for a healthy person is larger…
[2026 update] Area percent versus weight percent: the confusion that causes most arguments Replied, post #42 · Analytics › HPLC & UHPLC · 12 May 2026 · 0 likes The most useful reply I ever got about Area percent versus weight percent was a request to state my units. It sounds like pedantry and it has saved me twice.
Batch numbers that do not match the vial label — what changed since Replied, post #9 · Sourcing › Red flags · 7 May 2026 · 30 likes Reporting something here requires the batch, the date, the method and the document, which is exactly what makes the reports worth reading two years later.
Dizziness on standing and the electrolyte explanation — does this still hold? Replied, post #73 · Practice › Side effects · 26 Apr 2026 · 0 likes If someone has run Dizziness on standing properly I would rather read that than my own reconstruction of it. Posting mine only because the thread has gone quiet.
Fasting versus non-fasting and which tests care Replied, post #17 · Clinical › Bloodwork · 24 Apr 2026 · 30 likes Building on post #14 rather than restating it. The number people quote for fasting versus non-fasting is a central estimate presented without its interval, and the…
Stepping down deliberately, and how to do it without losing progress Replied, post #95 · Practice › Dosing & titration · 20 Apr 2026 · 9 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.
Transporting a vial for a weekend away — a second dataset Replied, post #29 · Practice › Storage & stability · 16 Apr 2026 · 0 likes Having read the whole Transporting a vial thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a…
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #40 · Start Here › Welcome · 13 Apr 2026 · 26 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…
Sample size intuition for a personal experiment — does this still hold? Replied, post #14 · Research Methods › Statistics · 10 Apr 2026 · 1 like Working an example through by hand once makes any of these concepts stick better than reading about them, and the arithmetic is usually a single line.
Revisiting: Is there a ceiling dose beyond which semaglutide stops adding benefit? Replied, post #5 · Compounds › Semaglutide · 23 Mar 2026 · 5 likes The 2.4 mg maintenance dose in the weight-management programme and the 1.0 mg diabetes dose are frequently discussed as though they were the same drug at different…
Second pass at: Identical chromatograms across two different lots Replied, post #84 · Sourcing › Red flags · 22 Mar 2026 · 0 likes The confident answers on Identical chromatograms and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this…
Second pass at: Identical chromatograms across two different lots Replied, post #65 · Sourcing › Red flags · 14 Mar 2026 · 18 likes Where somebody posts a concern, ask what would resolve it before arguing about it. Half of these threads end with a document nobody had asked for. That is all the…
Subgroup analyses: pre-specified versus discovered — a second dataset Replied, post #9 · Evidence › Trials · 14 Mar 2026 · 28 likes Picking up post #6: that is the part I would want checked first. Adding a small correction to the Subgroup analyses summary above rather than a disagreement with it.…
Rotating between abdomen, thigh and upper arm: absorption differences — one year on Replied, post #27 · Practice › Administration · 2 Mar 2026 · 0 likes Something worth flagging about Rotating between abdomen: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual pattern…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #31 · Research Methods › Statistics · 13 Feb 2026 · 5 likes Relative risk and odds ratios: both compare the rate in one group to the rate in another. Relative risk is easier to understand. Odds ratios are standard in many…
[2026 update] Reading a supplementary appendix and finding the interesting part Replied, post #15 · Evidence › Trials · 20 Jan 2026 · 1 like That matches what I have seen, for whatever a single anecdote is worth.
The headache that turns out to be dehydration Replied, post #137 · Nutrition & Training › Hydration & electrolytes · 14 Jan 2026 · 6 likes Where a laboratory result exists, quoting it with the reference interval makes the discussion tractable. Without it the thread is guesswork.
Research-use-only labelling: what it means and what it does not Replied, post #85 · Sourcing › Regulatory · 10 Jan 2026 · 0 likes An indication approved for one age range does not extend to another, and paediatric extensions are separate decisions with separate evidence.
Coming back to: Private prescribing in the UK: what is actually involved Replied, post #37 · Regional › UK & Ireland · 4 Jan 2026 · 3 likes Ireland: the Health Products Regulatory Authority implements EU framework. Prescription-only. Reimbursement for weight management has been more restrictive than for…
Constipation management, with a dietitian's contribution Replied, post #15 · Practice › Side effects · 1 Jan 2026 · 0 likes Grateful for the specificity. Vague answers to this question are what sent me looking.
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #49 · Access › Pricing · 30 Dec 2025 · 23 likes On post #48 — agreed on the reasoning, with one qualification. Offering a way to settle Price changes rather than another opinion about it. Two measurements, taken the…
Specification in the result column: why that is a meaningful error Replied, post #94 · Analytics › COA interpretation · 25 Dec 2025 · 0 likes Confirming post #92 from a second method, which matters more than confirming it from a second person. A certificate is a statement by its issuer that a defined test was…
Request: a diff view for wiki revisions — the long version Replied, post #82 · Meta › Feature requests · 10 Dec 2025 · 2 likes Helpful, and short, which on this subject is harder than long.
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #56 · Compounds › Other compounds · 24 Nov 2025 · 0 likes Adding the measurement that post #55 says would settle it. Research use only, not approved for human use, and in this subcategory the compounds vary enormously in how…
Angle of injection and whether 90 degrees is always right Replied, post #48 · Practice › Administration · 10 Nov 2025 · 3 likes Post #44 and I disagree about the size of the effect, not about the direction. A new needle for each injection is not fussiness. A needle blunts on first use and a…
How to ask about something you suspect is a bad idea Replied, post #23 · Start Here › How to Ask · 8 Nov 2025 · 2 likes Disagreement-style questions: "I read this and it contradicts what I heard here, which is right?" is answerable. "Is this a bad idea?" without giving the context is not.
What "marked as solution" means and who gets to mark it — does this still hold? Replied, post #2 · Start Here › Welcome · 5 Oct 2025 · 0 likes Marked solutions are the site's way of saying that someone asked a good question and someone else gave an answer that actually worked. It is not a competition and it…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #47 · Compounds › Cagrilintide & amylin analogues · 3 Oct 2025 · 0 likes On post #45 — agreed on the reasoning, with one qualification. On storage: aggregation-prone peptides are the ones where repeated warming and cooling does the most…
When a tidy document is a signal and when it is decoration Replied, post #10 · Analytics › COA interpretation · 17 Sep 2025 · 0 likes The single most useful discipline: read the document for what it does not say. The omissions are more consistent between suppliers than the numbers are. That much is…
Reading a supplier's product description as a marketing document Replied, post #63 · Compounds › Other compounds · 28 Aug 2025 · 0 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…
The nausea timeline across the first four weeks, with a tabulated log Replied, post #8 · Practice › Side effects · 21 Aug 2025 · 0 likes Adding what did not work for me on nausea timeline, since the failures never get written up and they are half the useful information.
Trial registration and comparing the protocol with the paper Replied, post #27 · Evidence › Trials · 5 Aug 2025 · 22 likes Effect sizes in a trial population reflect adherence achieved under trial conditions, which is generally better than adherence outside them.
What a documentation review can and cannot tell you Replied, post #48 · Sourcing › Independent verification · 26 Jul 2025 · 3 likes The thing about documentation review that took me longest to accept is that a plausible mechanism is not evidence of an effect. It is a reason to look, not a result.
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #53 · Data & Tools › Calculators · 16 Jul 2025 · 4 likes Post #52 answers the question as asked. The question underneath it is different. Agreed on titration planner refuses, with one qualification that I think matters. The…
Tracking that stops updating and then resumes Replied, post #6 · Sourcing › Logistics · 27 Jun 2025 · 8 likes Useful. I have added it to my own notes with the date on it.
Interpreting a composition change that is within the error bars Replied, post #5 · Outcomes › Body composition · 18 Jun 2025 · 0 likes Post #2 is the version of this I will quote in future. One addition. Lean mass in these measurements includes water, so a change in hydration appears as a change in…
A well-designed study with a badly written abstract Replied, post #127 · Evidence › Study critique · 3 Jun 2025 · 2 likes Post #124 put the caveat in the right place and I want to underline it. Hold a trial to the standard something could actually have met. A criticism that no achievable…
Asking about a compound your prescriber has not heard of Replied, post #54 · Clinical › Prescriber conversations · 1 Jun 2025 · 13 likes Reading back through, this was answered upthread and I missed it. My fault.
Obstructive sleep apnoea and a hard endpoint in this class Replied, post #94 · Clinical › Comorbidities · 25 May 2025 · 18 likes This follows post #91 rather than contradicting it. Obstructive sleep apnoea is a question about a distribution, not about a value, and treating it as a value is what…
Pregnancy as an absolute contraindication Replied, post #3 · marked as the solution · Safety › Contraindications · 16 May 2025 · 17 likes Nobody has said the unglamorous part of pregnancy yet, so: most of the variation is explained by things that are boring to write about and easy to check.
Documenting an adverse event properly — the long version Replied, post #2 · Safety › Adverse events · 1 May 2025 · 14 likes Reporting to regulatory agencies: if you have had a serious event, reporting it to the regulatory agency in your country can help with signal detection across the…
Revisiting: German, French and Dutch differences, compared Replied, post #16 · Regional › European Union · 28 Apr 2025 · 6 likes Nothing to add on the substance. Thank you for taking the question at face value.
Reconstituting a multi-strength kit without mixing yourself up Replied, post #46 · Practice › Reconstitution · 19 Mar 2025 · 14 likes This follows post #43 rather than contradicting it. Speaking only to reconstituting a multi-strength kit as I have actually seen it, rather than as it is usually…
Follow-up: Tesamorelin has an approved indication — what that changes about the evidence Replied, post #27 · Compounds › Secretagogues & GH axis · 19 Mar 2025 · 10 likes That is a fair summary of where the discussion has got to.
Biased agonism: a real phenomenon, an over-used explanation Replied, post #56 · Pharmacology › Receptor biology · 7 Mar 2025 · 21 likes The C-cell finding in rodent toxicology is a receptor-biology observation with a species-specific interpretation. It is the reason for a specific contraindication…
When to suspect the method rather than the sample Replied, post #90 · Analytics › Method validation · 1 Mar 2025 · 10 likes Why two laboratories may disagree: after validating the same method, they may still report different purity on the same sample due to integration differences, column…
Follow-up: Individual participant data versus aggregate data Replied, post #97 · Evidence › Meta-analyses · 11 Jan 2025 · 6 likes Post #96 is right about the mechanism and I think understates the practical bit. Individual participant data versus aggregate has a well-known answer and a correct…
Revisiting: What a well-designed human trial of a secretagogue would look like Replied, post #18 · Compounds › Secretagogues & GH axis · 6 Jan 2025 · 28 likes Research-use-only secretagogues are not approved for human use. That statement is doing real work in this subcategory, where the published evidence base is thinner than…
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #58 · Compounds › Semaglutide · 30 Dec 2024 · 16 likes Counter-ion form matters for the arithmetic and is almost never stated. A vial labelled 5 mg of peptide as an acetate salt and one labelled 5 mg as trifluoroacetate do…
Second pass at: A pen that felt like it delivered nothing: diagnosing it afterwards Replied, post #5 · Devices › Pens & autoinjectors · 26 Dec 2024 · 10 likes Coming back to post #3, because the follow-up matters more than the original answer. Comparing cost per milligram between a pen and a vial ignores wastage, dead volume…
Building a sensible monitoring schedule with your prescriber Replied, post #60 · Clinical › Bloodwork · 21 Dec 2024 · 21 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.
Ipamorelin selectivity claims and where they came from Started this topic · Compounds › Secretagogues & GH axis · 10 Dec 2024 · 0 likes Ipamorelin selectivity claims and where they came from — setting out what I have, and where I think it stops being reliable. Ipamorelin selectivity claims, from the…
Triple agonism: additive, synergistic, or neither? Started this topic · Compounds › Retatrutide · 25 Nov 2024 · 23 likes The question in the title: Triple agonism: additive, synergistic, or neither? I will give what I have already checked below so nobody repeats it. Asking about triple…
Follow-up: A site rotation scheme that is easy enough to actually follow Replied, post #64 · Practice › Administration · 29 Sep 2024 · 29 likes Confirming post #61 from a second method, which matters more than confirming it from a second person. Angle of injection: 90 degrees into pinched tissue ensures…
Meeting a protein target on a suppressed appetite — one year on Replied, post #15 · Nutrition & Training › Protein & intake · 17 Sep 2024 · 0 likes The arithmetic in post #13 is right; the assumption feeding it is the part to check. The practical problem is that appetite suppression makes hitting a target genuinely…
Chronic kidney disease and the FLOW result Replied, post #37 · Clinical › Comorbidities · 22 Aug 2024 · 0 likes I would put moderate confidence on the mainstream reading of chronic kidney disease and no more. That is not scepticism for its own sake; it is where the sourcing…
Reporting a discrepancy without making an allegation Replied, post #29 · Sourcing › Vendor reports · 16 Aug 2024 · 0 likes Selective submission and selective reporting are the two easiest ways for a result to be shaped, and blinding addresses the first while a commitment to post addresses…
Coming back to: Pricing far outside the range, in either direction Replied, post #5 · Sourcing › Red flags · 20 Jul 2024 · 2 likes Inconsistency across documents: a certificate stating one purity, a website claiming another, and a supplier's verbal representation claiming a third, all on the same…
Cold packs, phase-change material, and what survives ten days Replied, post #28 · Sourcing › Logistics · 20 Jun 2024 · 8 likes Appreciated. The plain phrasing does more work here than a longer post would.
The mass-error checker and its intended scope Replied, post #44 · Data & Tools › Calculators · 11 Jun 2024 · 0 likes Adding the measurement that post #42 says would settle it. The calculators maintained on this site are open-source and verifiable. They are intended to check…