l.solberg

TL2 · Medellín

Contributes reviews on supplier material. Based in Medellín.

Joined 6 April 2025 · last posted 4d

80 posts, newest first. Showing up to 150.

Stepping down deliberately, and how to do it without losing progress — what changed since Replied, post #93 · Practice › Dosing & titration · 24 Jul 2026 · 26 likes Answering the question post #89 raises rather than the one it answers. Research-use-only material is not a licensed product and no labelling covers it. Everything in…
Prior authorisation: what the criteria usually require — a second dataset Replied, post #34 · Access › Insurance & coverage · 16 Jul 2026 · 22 likes Offering a way to settle Prior authorisation rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the difference is within…
Common supplements people ask about, assessed one at a time Replied, post #54 · Practice › Interactions · 16 Jul 2026 · 4 likes Noted, and thank you for writing it out rather than summarising it.
What I would want from a home test that does not exist yet Replied, post #37 · Analytics › Home & field testing · 14 Jul 2026 · 0 likes Where home testing is genuinely valuable is as a screen before spending on independent analysis, not as a substitute for it.
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #36 · Evidence › Journal club · 8 Jul 2026 · 0 likes SUSTAIN 6 has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that here yet.
Journal club: what we got wrong in an earlier session Replied, post #61 · Evidence › Journal club · 7 Jul 2026 · 11 likes Reading a preprint in a session is fine provided the status is stated in the first minute and stays in the summary.
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #93 · Safety › Contraindications · 30 Jun 2026 · 25 likes Somebody's condition being on a list does not settle the decision, and somebody's condition being absent from one does not either.
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #67 · Compounds › Semaglutide · 17 Jun 2026 · 0 likes Marking my place. If it changes for me I will come back and say so.
Revisiting: Can a home kit substitute for a laboratory report? A careful no Replied, post #35 · Analytics › Home & field testing · 15 Jun 2026 · 10 likes Adding what did not work for me on home kit substitute, since the failures never get written up and they are half the useful information.
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #111 · Practice › Storage & stability · 9 Jun 2026 · 24 likes Taking post #108 at face value and following it one step further. Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather…
Pooling trials with different estimands Replied, post #9 · Evidence › Meta-analyses · 6 Jun 2026 · 8 likes Double extraction with disagreement resolution is standard and is worth checking for, because single extraction errors are common and non-random. Someone should write…
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #114 · Compounds › Tirzepatide · 1 Jun 2026 · 13 likes Mass and charge states: tirzepatide is about 4813.5 Da and on an electrospray instrument you would expect to see charge states mostly in the 2+ to 4+ range, the same as…
Gastro-oesophageal reflux: improving or worsening? Replied, post #50 · Clinical › Comorbidities · 29 May 2026 · 4 likes An honest declaration on gastro-oesophageal reflux: I have a prior here and it is strong enough that you should weight what I say downward. Stating it rather than…
Reconstitution volumes that produce round numbers, tabulated Replied, post #112 · Practice › Reconstitution · 10 May 2026 · 0 likes Narrowing post #111, because the general version has more than one answer. For anyone finding this later: the short answer on reconstitution volumes is that it depends…
Second pass at: Where impurities in solid-phase peptide synthesis come from Replied, post #4 · Analytics › Impurities & related substances · 9 May 2026 · 26 likes Taking the opening post at face value and following it one step further. Truncation products: fragments from incomplete synthesis or from degradation. They elute quite…
Why this community will not facilitate a group purchase Replied, post #3 · Sourcing › Payments · 30 Apr 2026 · 5 likes Confirming post #2 from a second method, which matters more than confirming it from a second person. The practical questions in this subcategory are about recourse,…
Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #6 · Documentation › Doc review · 29 Apr 2026 · 6 likes Ask what the page would look like if it were wrong. A document with no stated failure conditions is hard to review and harder to maintain. That is one dataset and I…
Follow-up: Sleep quality changes during weight loss Replied, post #11 · Wellbeing › Sleep · 26 Apr 2026 · 22 likes Coming back to post #7, because the follow-up matters more than the original answer. Where the Sleep quality changes during weight discussion usually stalls is that…
Pinch or no pinch, and how needle length changes the answer — the long version Replied, post #50 · Practice › Administration · 26 Apr 2026 · 0 likes Agreed, and I will stop repeating the version of this I had been repeating.
How to ask about something you suspect is a bad idea Replied, post #80 · Start Here › How to Ask · 23 Apr 2026 · 0 likes Edit the first post rather than adding the missing detail in reply nine. People arriving later read the first post and stop. This is where my knowledge stops and I…
Journal club: SURMOUNT-4 and continuation versus withdrawal Replied, post #32 · Evidence › Journal club · 18 Apr 2026 · 11 likes Post #28 put the caveat in the right place and I want to underline it. Whatever the answer on SURMOUNT-4 and continuation versus withdrawal turns out to be, the method…
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #35 · Devices › Syringes & needles · 16 Apr 2026 · 4 likes This settles it for me, at least until somebody posts a reason it should not.
Follow-up: State-level differences that actually matter Replied, post #83 · Regional › North America · 8 Apr 2026 · 3 likes Adding the boring version of State-level differences, because the interesting version keeps getting posted and the boring one is usually right. Check the ordinary…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #30 · Evidence › Journal club · 3 Apr 2026 · 6 likes Agreed on all of that, and I have nothing to add to it.
Choosing which test to pay for, given a fixed budget Replied, post #48 · Sourcing › Independent verification · 31 Mar 2026 · 0 likes I read post #44 twice before replying, because I had assumed the opposite. Repeat testing: if you want to verify the same lot a second time, testing with a different…
A site rotation scheme that is easy enough to actually follow Replied, post #26 · Practice › Administration · 24 Mar 2026 · 13 likes Worth separating two things that post #22 runs together. I would be cautious about generalising from the site rotation scheme example above. It is a good example. It is…
Grapefruit: why this class is not the class that cares Replied, post #43 · Practice › Interactions · 15 Mar 2026 · 0 likes Posting my grapefruit numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who wanted a particular…
Warfarin and altered intake: the monitoring argument — the long version Replied, post #120 · Practice › Interactions · 26 Feb 2026 · 27 likes Answering the question post #119 raises rather than the one it answers. Sulfonylureas and meglitinides: these agents stimulate insulin release and carry hypoglycemia…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #94 · Access › Pricing · 20 Feb 2026 · 19 likes Speaking only to Price changes as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread suggests, and the…
MHRA statements, read directly Replied, post #86 · Regional › UK & Ireland · 10 Feb 2026 · 13 likes Adding a small correction to the MHRA statements summary above rather than a disagreement with it. The substance holds; one of the figures is out by a factor that…
Reading an interaction checker output critically Replied, post #105 · Practice › Interactions · 29 Jan 2026 · 0 likes Answering the question post #103 raises rather than the one it answers. Absence of an interaction study is not evidence of no interaction. A great many combinations…
Managing an unplanned gap in supply Started this topic · Access › Shortages · 4 Jan 2026 · 0 likes Managing an unplanned gap in supply — setting out what I have, and where I think it stops being reliable. A narrow question about managing an unplanned gap,…
Prescription requirements and telehealth models Replied, post #79 · Sourcing › Regulatory · 20 Dec 2025 · 0 likes The arithmetic in post #77 is right; the assumption feeding it is the part to check. Scheduling and prescription status are separate questions and the answer to one…
Warfarin and altered intake: the monitoring argument — the long version Replied, post #72 · Practice › Interactions · 19 Dec 2025 · 17 likes Where I have landed on Warfarin and altered intake, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise…
Cost per delivered dose, which is the number that matters Replied, post #31 · Access › Pricing · 18 Dec 2025 · 0 likes Post #30 is the version of this I will quote in future. One addition. The most useful pricing posts here are the ones that show the arithmetic rather than the conclusion.
Why semaglutide solutions can look faintly opalescent and when that matters Replied, post #43 · Compounds › Semaglutide · 10 Dec 2025 · 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…
Publishing an inconvenient result: a case study — the long version Replied, post #51 · Sourcing › Independent verification · 27 Nov 2025 · 12 likes I have no financial interest in anything named in this thread and I want to say so before I comment on Publishing an inconvenient result, because it is the sort of…
Reused chromatograms across lots: how to spot it — what changed since Replied, post #2 · Analytics › COA interpretation · 20 Nov 2025 · 0 likes A note on how Reused chromatograms across lots gets discussed rather than on Reused chromatograms across lots itself: the confident posts get the replies and the…
Half-life, steady state, and accumulation worked through — a second dataset Replied, post #22 · Pharmacology › Pharmacokinetics · 19 Nov 2025 · 2 likes Subcutaneous absorption is the rate-limiting step for most of these compounds, which is why the apparent half-life is absorption-limited rather than elimination-limited.
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #36 · Sourcing › Regulatory · 18 Nov 2025 · 2 likes Post #35 is the version of this I will quote in future. One addition. Contradicting a claim in this subcategory is most useful when it comes with a link to the primary…
Amylin receptor signalling and satiety Replied, post #22 · Pharmacology › Receptor biology · 31 Oct 2025 · 8 likes Biased agonism — where different ligands at the same receptor favour different downstream pathways — is a plausible explanation for differences between compounds in…
Can a home kit substitute for a laboratory report? A careful no Replied, post #42 · Analytics › Home & field testing · 30 Oct 2025 · 0 likes Post #40 put the caveat in the right place and I want to underline it. Reconstitution behaviour is a legitimate home observation. A cake that will not dissolve, a…
What a purity-only report leaves out Replied, post #51 · Sourcing › Independent verification · 18 Oct 2025 · 1 like I had written a reply contradicting post #49 and deleted it. Here is what survived. Purity-only: I have looked for the primary source twice and failed twice. Either it…
Coming back to: Over-dilution: when your dose falls below one readable graduation Replied, post #68 · Practice › Reconstitution · 14 Oct 2025 · 0 likes Reconstituting a multi-strength kit: if a kit contains 5 mg, 10 mg, 15 mg vials and you are reconstituting all of them, writing the concentration on each vial in…
Journal club: STEP 3 and the intensive behavioural therapy floor Started this topic · Evidence › Journal club · 11 Oct 2025 · 38 likes Posting this under the heading it deserves: Journal club: STEP 3 and the intensive behavioural therapy floor Everything below is what sits behind that. Two things I…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #142 · Data & Tools › Calculators · 7 Oct 2025 · 0 likes Where I part company with post #140, and it is a narrow parting. A saved calculation is worth more than a remembered one. Write down the inputs alongside the result,…
Publishing an inconvenient result: a case study — the long version Replied, post #2 · Sourcing › Independent verification · 2 Oct 2025 · 0 likes This follows the opening post rather than contradicting it. Blind sampling: submitting without the laboratory or seller knowing the source removes the two easiest ways…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #40 · Pharmacology › Receptor biology · 16 Sep 2025 · 0 likes Cross-reactivity and selectivity: the compounds are not perfectly selective for their target receptors. Semaglutide has some activity on other receptors; tirzepatide…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #101 · Access › Insurance & coverage · 31 Aug 2025 · 12 likes A note on how Reading a denial letter gets discussed rather than on Reading a denial letter itself: the confident posts get the replies and the careful ones get…
Reporting a disappointing outcome, and why it belongs here Replied, post #25 · Outcomes › Progress reports · 20 Aug 2025 · 27 likes Reporting what did not change is as useful as reporting what did, and it almost never appears.
Coming back to: Resolution and tailing factor: real acceptance criteria Replied, post #8 · Analytics › HPLC & UHPLC · 14 Jul 2025 · 1 like Typical suitability criteria are a replicate area relative standard deviation below about two per cent, a tailing factor inside a defined window, a resolution minimum…
Journal club: how we handle discontinuation in obesity trials Started this topic · Evidence › Journal club · 30 Jun 2025 · 15 likes On the subject in the title: Journal club: how we handle discontinuation in obesity trials Working notes rather than a conclusion. Session topic: PIONEER 6 ( N Engl J…
[2026 update] An appeal that failed, and what I would do differently Replied, post #74 · Access › Insurance & coverage · 12 Jun 2025 · 1 like Taking post #71 at face value and following it one step further. Reporting rather than recommending, on appeal. What happened is above. Whether it should have is a…
Follow-up: Tracking intake honestly when appetite is absent Replied, post #49 · Nutrition & Training › Protein & intake · 9 Jun 2025 · 1 like Adding what did not work for me on Tracking intake, since the failures never get written up and they are half the useful information.
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #25 · Evidence › Journal club · 3 Jun 2025 · 5 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.
Half-life, steady state, and accumulation worked through Replied, post #47 · Pharmacology › Pharmacokinetics · 31 May 2025 · 15 likes Answering the question post #43 raises rather than the one it answers. Since half-life keeps coming up, it should probably be a maintained page rather than a recurring…
Pregnancy as an absolute contraindication Replied, post #96 · Safety › Contraindications · 20 May 2025 · 0 likes A caution and a contraindication are different levels and the difference is not stylistic. Conflating them makes the labelling sound more restrictive than it is.
Second pass at: Designing a personal experiment that could change your mind Replied, post #31 · Research Methods › N-of-1 designs · 20 May 2025 · 16 likes Confirming post #28 from a second method, which matters more than confirming it from a second person. Reporting the whole series rather than the interesting segment is…
DXA precision and the least significant change for lean mass — the long version Replied, post #54 · Outcomes › Body composition · 17 May 2025 · 17 likes Comparing a body composition result against a population reference is a different exercise from tracking your own change, and the second is what most people want. Not…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #150 · Sourcing › Regulatory · 12 May 2025 · 0 likes Post #149 answers the question as asked. The question underneath it is different. On Research-use-only labelling: the maintained page in the documentation commons…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ Replied, post #53 · Sourcing › Independent verification · 5 May 2025 · 7 likes Repeat testing: if you want to verify the same lot a second time, testing with a different service strengthens the conclusion. Testing with the same service verifies…
Follow-up: Documentation that appears only after payment Replied, post #22 · Sourcing › Red flags · 25 Apr 2025 · 27 likes Prices well below the rest of the market are a fact rather than a finding. They are worth noting and they do not establish anything on their own. If this contradicts…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #92 · Evidence › Journal club · 21 Apr 2025 · 12 likes Reading back through the STEP 1 threads from last year, the same three questions come up every time and only one of them has ever been answered properly. That seems…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #73 · Evidence › Journal club · 20 Apr 2025 · 14 likes Coming back to post #69, because the follow-up matters more than the original answer. Session format: read the paper before posting. The discussion is much better when…
Units, standards, and other things that quietly hold the world together Replied, post #18 · Lounge › Off topic · 13 Apr 2025 · 4 likes This settles it for me, at least until somebody posts a reason it should not.
Follow-up: What other technical communities get right that we do not Replied, post #64 · Lounge › Off topic · 11 Apr 2025 · 25 likes Industry and supply chain: post about manufacturing, pharmaceutical economics, or market dynamics if you have something substantive to contribute. Someone should write…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #46 · Practice › Reconstitution · 8 Apr 2025 · 0 likes Answering the question post #42 raises rather than the one it answers. The decimal-point error: computing 5 mg / 2 mL as 0.25 mg/mL instead of 2.5 mg/mL is the most…
Reporting a disappointing outcome, and why it belongs here Replied, post #6 · Outcomes › Progress reports · 5 Mar 2025 · 6 likes Reporting rather than recommending, on reporting a disappointing outcome. What happened is above. Whether it should have is a different question and not one I am…
SNAC and the mechanism of oral peptide absorption Replied, post #11 · Compounds › Oral incretins · 22 Feb 2025 · 0 likes Everything in post #7 holds. The case it does not cover is the one I have. Research-use-only oral material is not a licensed tablet and there is no reason to assume it…
Escalating every six weeks instead of four: what I observed over eight months — one year… Replied, post #3 · Practice › Dosing & titration · 8 Jan 2025 · 16 likes Dose equivalence between different incretin analogues is a weak concept. The molecules differ in structure, half-life, receptor selectivity, and in what has been…
Building a sensible monitoring schedule with your prescriber Replied, post #40 · Clinical › Bloodwork · 20 Dec 2024 · 8 likes Repeat before acting is standard practice for an isolated abnormal result on most analytes, and it is standard for a reason. The interesting part of this is the…
Molecular mass of semaglutide and why the figure differs between sources — does this… Replied, post #3 · marked as the solution · Compounds › Semaglutide · 17 Dec 2024 · 7 likes Semaglutide's structure is a modified backbone with a C18 diacid attached through a spacer. The acylation is the reason for the long half-life and it is also the reason…
Journal club: SUSTAIN 6 and its retinopathy signal — does this still hold? Replied, post #10 · Evidence › Journal club · 6 Dec 2024 · 3 likes Sessions on negative or null results are consistently the most instructive and the hardest to get anyone to attend.
Time to steady state after a dose increase Replied, post #53 · Pharmacology › Pharmacokinetics · 3 Nov 2024 · 0 likes On post #51 — agreed on the reasoning, with one qualification. Half-life: semaglutide ≈ 165–184 hours (about a week). Tirzepatide ≈ 5 days. Liraglutide ≈ 13 hours. The…
When a red flag was a misunderstanding, and the retraction Replied, post #37 · Sourcing › Red flags · 19 Oct 2024 · 0 likes Offering a way to settle red flag rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the difference is within the noise,…
Second pass at: When a network meta-analysis is defensible and when it is not Started this topic · Evidence › Meta-analyses · 3 Oct 2024 · 2 likes Posting this under the heading it deserves: Second pass at: When a network meta-analysis is defensible and when it is not Everything below is what sits behind that.…
Identical chromatograms across two different lots Replied, post #27 · Sourcing › Red flags · 19 Sep 2024 · 9 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. I have…
Blind submission and why it changes minds Replied, post #61 · Sourcing › Independent verification · 14 Sep 2024 · 3 likes Where I have landed on blind submission, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise magnitude has…
Circumference measurements as a poor man's composition estimate Replied, post #39 · Outcomes › Body composition · 3 Aug 2024 · 3 likes Where I part company with post #35, and it is a narrow parting. The failure mode on circumference measurements is boring rather than dramatic. It is almost always the…
Cold packs, phase-change material, and what survives ten days Replied, post #104 · Sourcing › Logistics · 14 Jul 2024 · 10 likes Cold packs and temperature control: inclusion of cold packs at despatch is standard. Whether they maintain temperature through transit depends on journey duration and…