a.krastev

TL2 · Trondheim

Contributes reviews on supplier material. Based in Trondheim.

Joined 2 January 2025 · last posted 2d

74 posts, newest first. Showing up to 150.

How to ask a question when you cannot say why you are asking it Replied, post #52 · Start Here › How to Ask · 26 Jul 2026 · 27 likes Adding the measurement that post #51 says would settle it. A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers…
Second pass at: Sleep apnoea improving and the equipment implications Replied, post #67 · Wellbeing › Sleep · 24 Jun 2026 · 30 likes Adding a note of thanks rather than an opinion. I did not know most of that.
Second pass at: Cost versus information: making the trade-off explicitly Replied, post #9 · Analytics › Home & field testing · 20 Jun 2026 · 28 likes Documenting home checks with dates and lots makes them accumulate into something. Undocumented ones evaporate and get remembered selectively.
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #11 · Analytics › Home & field testing · 18 Jun 2026 · 15 likes Adding thanks rather than a view. I do not have a view worth the space.
Journal club: what we got wrong in an earlier session Replied, post #12 · Evidence › Journal club · 18 Jun 2026 · 8 likes The figures usually contain the finding and the text usually contains the interpretation. Separating them for the first twenty minutes is a discipline worth keeping.
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #72 · Safety › Contraindications · 13 Jun 2026 · 1 like Somebody's condition being on a list does not settle the decision, and somebody's condition being absent from one does not either. Someone will know this better than I…
Review: a draft on reconstitution arithmetic, with objections — what changed since Replied, post #21 · Documentation › Doc review · 11 Jun 2026 · 8 likes Reviewing your own nomination is fine and is not sufficient. Somebody else has to read it for the process to mean anything. Take it as a starting point and not as a…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #105 · Research Methods › Statistics · 15 May 2026 · 4 likes Post #103 put the caveat in the right place and I want to underline it. Working an example through by hand once makes any of these concepts stick better than reading…
Lean mass preservation: what the evidence supports — does this still hold? Replied, post #76 · Outcomes › Body composition · 14 May 2026 · 0 likes Post #74 is the version of this I will quote in future. One addition. Percentage body fat is a ratio, so it changes when either component changes. A rising percentage…
The most useful thing you learned here that was not the answer you came for Replied, post #42 · Lounge › Off topic · 14 May 2026 · 26 likes Community norms: if you want to discuss how the community should work (not moderation decisions, which go in Meta) the Lounge is a place for that casual discussion. The…
Request: show the solution author in the topic list — what changed since Replied, post #69 · Meta › Feature requests · 3 May 2026 · 5 likes This is the answer, and the reason it is the answer is the more useful part.
Prescription requirements and telehealth models — a second dataset Replied, post #18 · Sourcing › Regulatory · 3 May 2026 · 13 likes My position on Prescription requirements and telehealth models is current rather than settled. I have revised it once already and I expect to again, so treat it…
Amylin receptor signalling and satiety — what changed since Replied, post #72 · Pharmacology › Receptor biology · 2 May 2026 · 1 like Amylin receptor signalling: amylin promotes satiety and slows gastric emptying through a receptor distinct from GLP-1. The hypothesis behind combination therapy is two…
What a certificate commits its issuer to — one year on Replied, post #59 · Analytics › COA interpretation · 30 Apr 2026 · 14 likes The signature block matters more than it appears to. A named individual with a date is a different kind of document from an unsigned one, whatever the numbers say.
[2026 update] Charge states for a 4 kDa peptide, worked through Replied, post #126 · Analytics › Mass spectrometry · 29 Apr 2026 · 0 likes What I would tell a new member reading about Charge states for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.
The best-written scientific paper you have read Replied, post #19 · Lounge › Off topic · 26 Apr 2026 · 0 likes Something I have wondered without ever asking: is there a good reason the vocabulary in this field is so inconsistent between suppliers? Half the disagreements here…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #95 · Practice › Reconstitution · 24 Apr 2026 · 23 likes Adding the measurement that post #94 says would settle it. Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #22 · Practice › Reconstitution · 23 Apr 2026 · 4 likes Concentration is total mass divided by total volume, and everything else follows from that. Ten milligrams into two millilitres is five milligrams per millilitre, and…
Foaming during reconstitution and whether it matters — the long version Replied, post #95 · Practice › Reconstitution · 11 Apr 2026 · 14 likes Foaming during reconstitution is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
Spike-and-recover accuracy for a peptide assay Replied, post #95 · Analytics › Method validation · 10 Apr 2026 · 0 likes That is consistent with mine, for whatever one more account is worth.
[2026 update] Thyroid function tests during substantial weight change Replied, post #19 · Clinical › Bloodwork · 20 Mar 2026 · 19 likes Post #18 answers the question as asked. The question underneath it is different. A trend needs at least three points to be a trend. Two points are a line and a line…
Why a compound being unapproved is not the same as being illegal to possess Replied, post #64 · Sourcing › Regulatory · 2 Mar 2026 · 10 likes That is a fair summary of where the discussion has got to.
Preprint servers and what screening they do Replied, post #74 · Evidence › Preprints · 2 Mar 2026 · 7 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.
A widely repeated interaction claim that turns out to be unsupported — what changed since Replied, post #4 · Practice › Interactions · 27 Feb 2026 · 5 likes Anything that also slows gut motility compounds the same mechanism. That is a plausibility argument rather than a documented interaction, and it should be labelled as…
Coming back to: Washout: how long is long enough, and for what purpose Replied, post #54 · Pharmacology › Pharmacokinetics · 26 Feb 2026 · 0 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Absence of evidence and evidence of absence Replied, post #19 · Research Methods › Statistics · 25 Feb 2026 · 6 likes Picking up post #17: that is the part I would want checked first. A distribution shown is worth ten summary statistics. Where a paper shows individual data points, read…
[2026 update] A rising related-substance total over six months: degradation or method… Replied, post #69 · Analytics › Impurities & related substances · 19 Feb 2026 · 7 likes Dimer and higher-order multimers: two or more peptide molecules bonded together. They appear at double the mass and higher. They may or may not separate from the…
Mass error in ppm: the arithmetic and the caveat Replied, post #80 · Analytics › Mass spectrometry · 14 Feb 2026 · 2 likes Answering the mass error in ppm question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it depends on how the…
Publication bias detection and its low power — does this still hold? Replied, post #3 · Evidence › Meta-analyses · 19 Dec 2025 · 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…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #114 · Documentation › Doc review · 17 Dec 2025 · 23 likes I had written a reply contradicting post #112 and deleted it. Here is what survived. Reading this Promotion criteria thread as someone who came in with a fixed view:…
Receptor desensitisation as a tolerance hypothesis, and its weak evidence — the long… Replied, post #16 · Pharmacology › Receptor biology · 17 Dec 2025 · 0 likes Pharmacological class effects: all GLP-1 agonists slow gastric emptying and suppress appetite. Those are class effects, not unique to one compound. Effects that differ…
Packaging that arrived damaged: documenting it properly — a second dataset Replied, post #7 · Sourcing › Logistics · 12 Dec 2025 · 5 likes Building on post #4 rather than restating it. Packaging integrity on arrival: if a parcel arrives with compromised packaging, that is evidence of a handling problem in…
Publishing an inconvenient result: a case study — the long version Replied, post #66 · Sourcing › Independent verification · 11 Dec 2025 · 4 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…
Batch date after test date, and other internal inconsistencies Replied, post #25 · Analytics › COA interpretation · 9 Dec 2025 · 0 likes I had written a reply contradicting post #23 and deleted it. Here is what survived. On batch date: the maintained page in the documentation commons covers the general…
Pooling trials with different estimands — what changed since Replied, post #59 · Evidence › Meta-analyses · 1 Dec 2025 · 19 likes When trials differ in population, duration and comparator, the pooled estimate answers a question no individual trial asked. That is worth saying before the number is…
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #101 · Practice › Reconstitution · 27 Nov 2025 · 1 like Confirming post #98 from a second method, which matters more than confirming it from a second person. Add the diluent down the side of the vial rather than directly…
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #39 · Start Here › Welcome · 16 Oct 2025 · 29 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…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #73 · Documentation › Doc review · 12 Oct 2025 · 28 likes On post #69 — agreed on the reasoning, with one qualification. A promotion that is declined should leave the topic linked from wherever the question recurs, so the work…
Why the timeline is on the right and not the left Replied, post #66 · Meta › Site feedback · 9 Sep 2025 · 6 likes Thank you for the correction. I would rather find out here than later.
Reaching a dose and staying there for a year: a longitudinal note — does this still hold? Replied, post #36 · Practice › Dosing & titration · 4 Sep 2025 · 7 likes If symptoms reset at each step, that is the expected pattern rather than a sign that the previous adaptation was imaginary. Every dose increase is a new exposure.
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #130 · Compounds › Secretagogues & GH axis · 3 Sep 2025 · 10 likes I had written a reply contradicting post #126 and deleted it. Here is what survived. A mass result for a short peptide is more discriminating than for a long one,…
A parcel that arrived warm: a decision process, not a verdict Replied, post #22 · Practice › Storage & stability · 2 Sep 2025 · 26 likes Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear. The answer…
[2026 update] Splitting an overlong document into two Replied, post #29 · Documentation › Wiki requests · 2 Sep 2025 · 0 likes A request is more likely to succeed with a proposed outline attached. "Somebody should write about X" rarely moves; a structure and two sections does. The general case…
TB-500 and thymosin beta-4: the fragment versus the protein Replied, post #95 · Compounds › Repair & healing peptides · 8 Aug 2025 · 8 likes Post #94 is right about the mechanism and I think understates the practical bit. Dose-response is unstudied in humans for essentially everything in this family, which…
Sequence verification for an obscure compound: how it is done Replied, post #107 · Compounds › Other compounds · 28 Jul 2025 · 0 likes Agreed, and I will stop repeating the version of this I had been repeating.
Coming back to: Official shortage notices and what they authorise Replied, post #67 · Access › Shortages · 24 Jul 2025 · 0 likes The published shortage register maintained by the national regulator is the authoritative source here, and it is updated far more often than any thread.
Publishing an inconvenient result: a case study Replied, post #47 · Sourcing › Independent verification · 10 Jul 2025 · 28 likes Building on post #46 rather than restating it. It does not extend to lots nobody has seen, it is not a recommendation, and it says nothing about anything other than…
Which panel is worth repeating and which is worth ignoring Replied, post #56 · Clinical › Bloodwork · 9 Jul 2025 · 0 likes Where a panel includes a calculated value, that value inherits the imprecision of everything it was calculated from and is usually reported without an interval.
Discussing something you have already been doing — the long version Replied, post #6 · marked as the solution · Clinical › Prescriber conversations · 6 Jul 2025 · 16 likes A question phrased as "what would you want to see before considering X" is answerable and is not a request for X.
Sodium, potassium and magnesium when intake drops Replied, post #43 · Nutrition & Training › Hydration & electrolytes · 4 Jul 2025 · 0 likes The confident answers on sodium and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this category.
[2026 update] Clearance pathways and what renal impairment changes Replied, post #65 · Pharmacology › Pharmacokinetics · 25 Jun 2025 · 1 like This follows post #64 rather than contradicting it. Agreed on Clearance pathways, with one qualification that I think matters. The reasoning holds for the case as…
[2026 update] Cardiovascular risk: reading the outcome trials as a set Replied, post #58 · Clinical › Comorbidities · 24 Jun 2025 · 21 likes Where a condition is well controlled and where it is not are different questions and the published data rarely distinguishes them.
A report I filed that turned out to be wrong, and the correction Replied, post #85 · Sourcing › Vendor reports · 4 Jun 2025 · 10 likes Answering the question post #83 raises rather than the one it answers. Report the certificate figure alongside the independent one. The comparison is the point and it…
Reading a trial's population section before its results — does this still hold? Replied, post #117 · Evidence › Trials · 18 May 2025 · 7 likes Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but not the practical magnitude. The event rate in each arm and the difference between…
Coverage for the indication versus for the drug Replied, post #43 · Access › Insurance & coverage · 26 Apr 2025 · 17 likes Answering the question post #40 raises rather than the one it answers. One more thing on coverage that took me far too long to see: the two figures people quote are not…
Shakes versus food: a pragmatic assessment — the long version Replied, post #8 · Nutrition & Training › Protein & intake · 24 Apr 2025 · 29 likes Post #4 put the caveat in the right place and I want to underline it. Protein targets during weight loss: the standard recommendation is 1.6 to 2.2 grams per kilogram…
Preparing for an appointment: one page, three questions Replied, post #13 · Clinical › Prescriber conversations · 2 Apr 2025 · 0 likes Bringing a record of symptoms with dates and severities makes an assessment materially easier and is the single most useful preparation. Worth saying I have only my own…
Coming back to: What published stability data actually covers, and what it does not Replied, post #11 · Practice › Storage & stability · 26 Mar 2025 · 29 likes The question underneath published stability data actually covers is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it.…
An orphaned page with no inbound links Replied, post #19 · Meta › Wiki maintenance · 19 Mar 2025 · 0 likes Careful with that. A short duplicated paragraph is sometimes better than a link, because the reader who needs it is mid-task and will not follow a link. The test is…
Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #49 · Evidence › Journal club · 17 Mar 2025 · 18 likes Post #48 is right about the mechanism and I think understates the practical bit. The figures usually contain the finding and the text usually contains the…
Why oral semaglutide needs an absorption enhancer at all — what changed since Started this topic · Compounds › Oral incretins · 23 Feb 2025 · 5 likes Asking directly, because I could not find a straight answer: Why oral semaglutide needs an absorption enhancer at all — what changed since What changes if the standard…
Protein density versus volume when you cannot eat much Replied, post #90 · Nutrition & Training › Protein & intake · 8 Feb 2025 · 7 likes Meeting protein targets on suppressed appetite: this is where the practical difficulty lies. Eating more protein when appetite is suppressed is genuinely hard.…
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #119 · Evidence › Journal club · 7 Feb 2025 · 18 likes I had written a reply contradicting post #117 and deleted it. Here is what survived. The figures usually contain the finding and the text usually contains the…
What we do not know about retatrutide, listed explicitly Replied, post #54 · Compounds › Retatrutide · 13 Jan 2025 · 9 likes Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is…
When "no data" is the complete and final answer Replied, post #60 · Compounds › Other compounds · 7 Jan 2025 · 13 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…
[2026 update] New subcategory: rationale and scope Replied, post #116 · Meta › Announcements · 3 Jan 2025 · 1 like Post #115 is right about the mechanism and I think understates the practical bit. On New subcategory, the part that usually goes wrong is that the question is asked as…
[2026 update] New subcategory: rationale and scope Replied, post #66 · Meta › Announcements · 15 Dec 2024 · 4 likes Answering the New subcategory question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it depends on how the first…
EMA product information as a primary source — does this still hold? Replied, post #131 · Regional › European Union · 18 Nov 2024 · 23 likes I read post #130 twice before replying, because I had assumed the opposite. Nobody has said the unglamorous part of EMA product information yet, so: most of the…
Blind submission and why it changes minds Replied, post #81 · Sourcing › Independent verification · 7 Oct 2024 · 4 likes The record shows what was measured. Everything beyond that is inference and this site tries to keep the line visible. Adding it because I spent an afternoon working it…
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #83 · Sourcing › Independent verification · 24 Sep 2024 · 10 likes If you are new and reading this thread for the answer to Splitting a vial: the answer is conditional, the conditions are in the third reply, and the rest of the thread…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #6 · Compounds › Other compounds · 17 Sep 2024 · 0 likes Answering the question post #2 raises rather than the one it answers. Two people in this thread mean different things by Melanocortin agonists and are disagreeing about…
Why a preprint's supplementary material is often the best part Replied, post #11 · Evidence › Preprints · 3 Sep 2024 · 1 like Adding the measurement that post #9 says would settle it. Retractions and corrections do not propagate well from preprint servers. A citation that was fine when made…
The topic list is dense — is that deliberate? Replied, post #16 · Meta › Site feedback · 20 Aug 2024 · 0 likes The version of topic list that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it holds, and those…
Guidelines revision: what changed and why Replied, post #15 · Meta › Announcements · 25 Jul 2024 · 7 likes The arithmetic in post #13 is right; the assumption feeding it is the part to check. I would be cautious about generalising from the guidelines revision example above.…