a.sorensen

TL2 · Plovdiv

Contributes reviews on supplier material. Based in Plovdiv.

Joined 28 September 2024 · last posted 1d

73 posts, newest first. Showing up to 150.

Coming back to: Why I now write the concentration on the vial in marker Replied, post #13 · Practice › Reconstitution · 27 Jul 2026 · 2 likes The arithmetic in post #12 is right; the assumption feeding it is the part to check. On a U-100 insulin syringe, one hundred units is one millilitre and one unit is…
Immortal time bias in a claims-database study — one year on Replied, post #43 · Evidence › Study critique · 25 Jul 2026 · 8 likes Defending a design that is being criticised unfairly is as useful as criticising one that deserves it, and it happens far less often. I am aware this is the third time…
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #89 · Compounds › Retatrutide · 24 Jul 2026 · 24 likes Comparisons with tirzepatide are being made across trials rather than within one. Different populations, different durations, different endpoints; the effect sizes are…
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #99 · Access › International · 22 Jul 2026 · 0 likes Temperature-controlled material and long-haul travel is a practical problem with practical solutions, none of which are on the packaging. It is the sort of thing that…
Documenting a supplier's response to a discrepancy Replied, post #42 · Sourcing › Vendor reports · 19 Jul 2026 · 6 likes I had written a reply contradicting post #40 and deleted it. Here is what survived. The cost of a submission is worth stating. It is the main reason people do not do…
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #116 · Evidence › Journal club · 18 Jul 2026 · 17 likes Reading order that works for these sessions: registry entry, methods, baseline table, primary result, then abstract last. Reading the abstract first anchors everything…
What a certificate commits its issuer to Replied, post #40 · Analytics › COA interpretation · 16 Jul 2026 · 0 likes I had written a reply contradicting post #36 and deleted it. Here is what survived. "Not less than 98 per cent" is a specification. "98.3 per cent" is a result. A…
Osteoarthritis and mechanical versus metabolic improvement — one year on Replied, post #12 · Clinical › Comorbidities · 9 Jul 2026 · 15 likes I have no financial interest in anything named in this thread and I want to say so before I comment on Osteoarthritis and mechanical versus metabolic, because it is the…
Prior authorisation: what the criteria usually require — a second dataset Replied, post #10 · Access › Insurance & coverage · 8 Jul 2026 · 3 likes I had written a reply contradicting post #6 and deleted it. Here is what survived. Small methodological point on Prior authorisation: repeating a measurement is cheap…
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #76 · Evidence › Journal club · 2 Jul 2026 · 0 likes The version of SURMOUNT-OSA that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
Asking a follow-up: new topic or new reply? Replied, post #10 · Start Here › How to Ask · 14 Jun 2026 · 7 likes Post #6 and I disagree about the size of the effect, not about the direction. Chromatogram questions: describe the method first. Column type, gradient, wavelength,…
Injecting into an area that has become firm: why not to Replied, post #51 · Practice › Administration · 11 Jun 2026 · 0 likes Alcohol swabbing and letting the site dry is the whole of the preparation for a subcutaneous injection into intact skin. Injecting before it dries is what stings.
Preservatives: function, testing, and limits — one year on Replied, post #21 · Pharmacology › Formulation chemistry · 3 Jun 2026 · 31 likes Post #20 is the version of this I will quote in future. One addition. Emulsification and suspensions: some formulations are emulsions or suspensions rather than…
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #55 · Safety › Contraindications · 30 May 2026 · 19 likes Personal or family history of medullary thyroid carcinoma, or multiple endocrine neoplasia type 2, is the clearest contraindication in this class and it is specific…
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #89 · Compounds › Tirzepatide · 25 May 2026 · 31 likes The version of Tirzepatide and nausea that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #37 · Compounds › Semaglutide · 24 May 2026 · 21 likes I had written a reply contradicting post #35 and deleted it. Here is what survived. On the injection-day question: the labelling for licensed semaglutide allows the day…
Citation sweep results: how many references did not say what was claimed Replied, post #99 · Meta › Wiki maintenance · 21 May 2026 · 27 likes Quietly grateful for the plain phrasing. Not every thread gets that.
Why fasting instructions for oral semaglutide are not optional advice Replied, post #5 · Compounds › Oral incretins · 16 May 2026 · 0 likes Why administration conditions matter for oral semaglutide and not for injectables: the oral formulation depends on a transient pH effect in the stomach. Anything that…
Revisiting: What pooling buys you and what it destroys Replied, post #23 · Evidence › Meta-analyses · 15 May 2026 · 13 likes I came in to disagree and I am leaving without a disagreement.
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #118 · Devices › Syringes & needles · 14 May 2026 · 16 likes Where I have landed on 0.3 ml versus 0.5 ml, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise magnitude…
Journal club: LEADER as the historical anchor Replied, post #70 · Evidence › Journal club · 6 May 2026 · 0 likes The most common failure mode is spending fifty minutes on the effect size and ten on the population. Reversing that ratio would improve most sessions.
Whether an aggregate is worth publishing at all: a disputed topic — does this still hold? Replied, post #16 · Data & Tools › Datasets · 30 Apr 2026 · 14 likes I read post #12 twice before replying, because I had assumed the opposite. Aggregating first-hand accounts does not produce evidence of the kind a trial produces. It…
Reading U-100 graduations, with a conversion table — one year on Replied, post #7 · Devices › Syringes & needles · 26 Mar 2026 · 0 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Reading U-100 graduations, with a conversion table Replied, post #14 · Devices › Syringes & needles · 2 Mar 2026 · 2 likes Insulin syringe graduations: U-100 syringes are marked in units where 100 units = 1 mL. Always confirm your syringe is U-100. Confusion between insulin units and…
Stepping down deliberately, and how to do it without losing progress Replied, post #58 · Practice › Dosing & titration · 14 Feb 2026 · 1 like A titration plan written down in advance is easier to stick to and easier to abandon deliberately. An improvised one becomes a series of decisions made on the worst day…
Publication bias detection and its low power — does this still hold? Replied, post #11 · Evidence › Meta-analyses · 9 Feb 2026 · 0 likes Study quality and weighting: some meta-analyses weight all studies equally; others weight by study size or study quality. The choice affects the result and should be…
Shoulders, tangent skims, and defensible integration — the long version Replied, post #11 · Analytics › HPLC & UHPLC · 3 Feb 2026 · 1 like Confirming post #9 from a second method, which matters more than confirming it from a second person. Carryover from a previous injection shows up as a small peak at the…
When to stop reading forums, including this one Replied, post #84 · Wellbeing › Mental health · 2 Feb 2026 · 1 like Confirming post #83 from a second method, which matters more than confirming it from a second person. The social side of this — how other people respond to visible…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #125 · Compounds › Oral incretins · 2 Jan 2026 · 17 likes Research-use-only oral material is not a licensed tablet and there is no reason to assume it carries a functioning absorption-enhancement system at all. The formulation…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #97 · Analytics › COA interpretation · 25 Dec 2025 · 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…
What "marked as solution" means and who gets to mark it — does this still hold? Replied, post #21 · Start Here › Welcome · 16 Dec 2025 · 11 likes Nobody is going to check your credentials and nobody is going to ask. What gets asked for is the basis of a claim, which is a different thing and applies equally to…
Tracking a preprint to publication: a worked example Replied, post #128 · Evidence › Preprints · 13 Dec 2025 · 8 likes Where a preprint's numbers are the basis of a claim being repeated here, someone should check whether the published version exists yet. That check is nearly always…
Follow-up: The decimal-point error, and the habit that catches it Replied, post #116 · Practice › Reconstitution · 9 Dec 2025 · 2 likes Everything in post #112 holds. The case it does not cover is the one I have. Two questions I would want answered before drawing anything from the decimal-point error…
Tracking that stops updating and then resumes — the long version Replied, post #32 · Sourcing › Logistics · 31 Oct 2025 · 3 likes Import restrictions by jurisdiction: what is legal to import for personal use varies enormously by country. Some jurisdictions are quite permissive; others are not.…
Power cut for eleven hours: how I assessed it afterwards Replied, post #106 · Practice › Storage & stability · 22 Oct 2025 · 0 likes The arithmetic in post #105 is right; the assumption feeding it is the part to check. Clarity is a weak test. A solution can lose a significant fraction of its active…
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #34 · Compounds › Tirzepatide · 20 Oct 2025 · 0 likes SURMOUNT-1 reported weight reduction of a magnitude that was the largest for a pharmacological intervention at that time of publication. It also reported a clear dose…
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #56 · Start Here › Welcome · 17 Oct 2025 · 6 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…
Reconciling a supplier certificate with an independent result Replied, post #7 · Sourcing › Vendor reports · 16 Oct 2025 · 16 likes Answering the question post #3 raises rather than the one it answers. Report the certificate figure alongside the independent one. The comparison is the point and it is…
MHRA statements, read directly Replied, post #10 · Regional › UK & Ireland · 2 Oct 2025 · 24 likes Bookmarking this. I will come back when I have something worth adding.
Compounds this community declines to help with, and why Replied, post #30 · Compounds › Other compounds · 29 Sep 2025 · 23 likes Reading rather than answering, but this is the post I would point somebody at.
Payment method and the leverage it gives you, ranked Replied, post #25 · Sourcing › Payments · 17 Sep 2025 · 28 likes Reading back through the payment method threads from last year, the same three questions come up every time and only one of them has ever been answered properly. That…
Follow-up: The decimal-point error, and the habit that catches it Replied, post #53 · Practice › Reconstitution · 3 Sep 2025 · 4 likes Post #51 and I disagree about the size of the effect, not about the direction. Preservative effectiveness is tested against a defined microbial challenge under defined…
Realistic expectations for strength while losing weight quickly Replied, post #15 · Nutrition & Training › Resistance training · 20 Aug 2025 · 16 likes Post #14 describes the usual case. This is about the unusual one. Cardiovascular work has its own benefits and is not a substitute for a resistance stimulus for this…
Why fasting instructions for oral semaglutide are not optional advice — does this still… Replied, post #82 · Compounds › Oral incretins · 14 Aug 2025 · 32 likes I had written a reply contradicting post #80 and deleted it. Here is what survived. Orforglipron is a small molecule, not a peptide. That changes almost everything: no…
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #53 · Compounds › Secretagogues & GH axis · 11 Aug 2025 · 0 likes Adding the measurement that post #52 says would settle it. A mass result for a short peptide is more discriminating than for a long one, because a single residue…
Immortal time bias in a claims-database study Replied, post #15 · Evidence › Study critique · 7 Aug 2025 · 20 likes Building on post #12 rather than restating it. Careful with the language on immortal time bias. "Not detected" and "not present" are different findings and the first is…
[2026 update] What we do not know about retatrutide, listed explicitly Replied, post #34 · Compounds › Retatrutide · 3 Aug 2025 · 30 likes The arithmetic in post #31 is right; the assumption feeding it is the part to check. Mass and identity: a report on retatrutide should state the mass detected by LC-MS,…
A ten-fold dose error caught before injection — one year on Replied, post #76 · Devices › Syringes & needles · 3 Aug 2025 · 0 likes Aspirating before injection: for subcutaneous injection, aspirating (pulling back on the plunger to check for blood) is not necessary and is sometimes discouraged…
Which panel is worth repeating and which is worth ignoring Replied, post #73 · Clinical › Bloodwork · 31 Jul 2025 · 0 likes Panel has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #57 · Access › Insurance & coverage · 26 Jul 2025 · 20 likes The most useful reply I ever got about Reading a denial letter was a request to state my units. It sounds like pedantry and it has saved me twice.
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #5 · Compounds › Secretagogues & GH axis · 22 Jul 2025 · 0 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…
Coming back to: Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #33 · Compounds › Cagrilintide & amylin analogues · 9 Jul 2025 · 15 likes Adding a reference point for Nausea profile of amylin analogues. Mine is a single case, collected without controls, and I am posting the method alongside it so it can…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #133 · Devices › Cold chain · 30 Jun 2025 · 0 likes I read post #129 twice before replying, because I had assumed the opposite. A temperature indicator that has tripped tells you a threshold was crossed. It does not tell…
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #59 · Evidence › Journal club · 29 Jun 2025 · 0 likes Reading order that works for these sessions: registry entry, methods, baseline table, primary result, then abstract last. Reading the abstract first anchors everything…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #16 · Documentation › Doc review · 23 Jun 2025 · 0 likes This follows post #14 rather than contradicting it. I would call the community position on Promotion criteria likely rather than established, and I would be comfortable…
An emergency department visit, described afterwards Replied, post #24 · Safety › Adverse events · 25 May 2025 · 0 likes Speaking only to emergency department visit as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ Replied, post #80 · Sourcing › Independent verification · 11 May 2025 · 5 likes Worth separating two things that post #78 runs together. Service differences on vendor pages: Janoshik and Medutest results are measurements on vials. PeptideMeter…
Albumin binding and how it produces a long half-life Replied, post #31 · Pharmacology › Pharmacokinetics · 1 May 2025 · 1 like Narrowing post #30, because the general version has more than one answer. The most useful reply I ever got about albumin binding was a request to state my units. It…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #40 · Compounds › Retatrutide · 20 Apr 2025 · 0 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…
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #25 · Compounds › Retatrutide · 20 Apr 2025 · 9 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #15 · Devices › Pens & autoinjectors · 9 Apr 2025 · 4 likes Pen confusion between compounds: if you are using multiple pens or alternating pens, confirming you have the correct pen before injection prevents administration…
Requesting a page: what makes a good request Replied, post #24 · Documentation › Wiki requests · 15 Mar 2025 · 0 likes Review cadence should be part of the proposal. A page about a fast-moving area needs a shorter cycle and somebody willing to honour it. Small point, but it is the one…
When a preprint is the best available evidence and we say so — a second dataset Replied, post #15 · Evidence › Preprints · 4 Mar 2025 · 0 likes Screening on a preprint server is minimal and is not review. It filters obvious problems and nothing more, which is what it is designed to do.
[2026 update] New subcategory: rationale and scope Replied, post #131 · Meta › Announcements · 8 Jan 2025 · 6 likes I would keep New subcategory 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 is…
Transporting a vial for a weekend away Replied, post #21 · Practice › Storage & stability · 31 Oct 2024 · 0 likes Sensible. I would want the same detail before I acted on it either.
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #61 · Analytics › Method validation · 28 Oct 2024 · 1 like Post #57 describes the usual case. This is about the unusual one. Precision and repeatability: within-run and between-run variability of the method. Acceptance…
Revisiting: A staff appointment, and what the role involves Replied, post #3 · Meta › Announcements · 7 Oct 2024 · 18 likes Reading this as a member rather than staff: the change is sensible and the explanation is better than the change. Publishing the failure mode that prompted it is what…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #124 · Nutrition & Training › Hydration & electrolytes · 30 Sep 2024 · 1 like Post #120 and I disagree about the size of the effect, not about the direction. Symptoms attributed to electrolytes here are non-specific and overlap with dehydration,…
When a red flag was a misunderstanding, and the retraction Replied, post #2 · Sourcing › Red flags · 12 Aug 2024 · 31 likes Second this, and I would have said it less carefully.
Guidelines revision: what changed and why Replied, post #123 · Meta › Announcements · 28 Jul 2024 · 4 likes The rare case here is the one that costs somebody a week, though, and the common case costs everyone ten seconds. I think the trade is clearly correct. Correct me on…
The mass-error checker and its intended scope Replied, post #160 · Data & Tools › Calculators · 28 Jul 2024 · 5 likes Tools that run entirely in the browser send nothing anywhere, which matters more to some people here than others and is worth stating either way.
Second pass at: Retatrutide dose escalation in the published trials Replied, post #106 · Compounds › Retatrutide · 23 Jul 2024 · 0 likes Small correction to my own earlier position on Retatrutide dose escalation. I had the units the wrong way round, which changes the conclusion by an order of magnitude…
Spreadsheets: an appreciation Replied, post #28 · Lounge › Off topic · 10 Jun 2024 · 0 likes No disagreement from me. Posting only so the question does not look ignored.