f.fonseca

TL2 Moderator · Trondheim

Contributes reviews on supplier material. Based in Trondheim.

Joined 1 October 2025 · last posted 5d

56 posts, newest first. Showing up to 150.

Restarting after a long gap: what the labelling implies Replied, post #40 · Practice › Dosing & titration · 23 Jul 2026 · 21 likes Steady state means the plasma concentration is stable from dose to dose. That happens around 4 to 5 half-lives. Before that, the concentration is rising with each dose.…
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #111 · Evidence › Journal club · 16 Jul 2026 · 24 likes On post #107 — agreed on the reasoning, with one qualification. STEP 1 (N Engl J Med 2021): The pivotal obesity trial for semaglutide and the reference point for most…
Tracking intake honestly when appetite is absent Replied, post #85 · Nutrition & Training › Protein & intake · 4 Jul 2026 · 21 likes Picking up post #82: that is the part I would want checked first. Micronutrition alongside protein: eating protein foods that are also good sources of micronutrients…
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #73 · Evidence › Journal club · 1 Jul 2026 · 1 like Critical appraisal template: (1) What did the trial set out to estimate? (2) Could the design answer that question? (3) Was the population sufficiently similar to your…
Coming back to: Where the four-week escalation interval comes from, and what it is not Replied, post #5 · marked as the solution · Practice › Dosing & titration · 29 Jun 2026 · 7 likes Titrating on tolerability rather than on the calendar: some people escalate when they tolerate a dose well, others escalate on the prescribed schedule regardless. The…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #95 · Practice › Reconstitution · 23 Jun 2026 · 7 likes Osmolarity and reconstitution: the osmolarity of the reconstituted solution affects comfort on injection. Isotonic solutions (close to blood osmolarity) are less…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #91 · Evidence › Journal club · 14 Jun 2026 · 3 likes post #90 answers the question as asked. The question underneath it is different. Session format: read the paper before posting. The discussion is much better when…
Prescription requirements and telehealth models — a second dataset Replied, post #40 · Sourcing › Regulatory · 24 May 2026 · 6 likes Labelling and intended use: a compound sold as "research-use-only" does not change its pharmacology if ingested. It changes the legal status of the sale. The labelling…
How much fluid is actually needed, and how you would know Replied, post #11 · Nutrition & Training › Hydration & electrolytes · 22 May 2026 · 4 likes This follows post #8 rather than contradicting it. Sodium: losing weight involves losing some sodium. Electrolyte drinks or salty foods help maintain sodium balance.…
Revisiting: What pooling buys you and what it destroys Replied, post #28 · Evidence › Meta-analyses · 20 May 2026 · 0 likes I read post #26 twice before replying, because I had assumed the opposite. Pooled estimates and heterogeneity: when trials differ in population, duration, or…
Fasting versus non-fasting and which tests care Replied, post #26 · Clinical › Bloodwork · 10 May 2026 · 0 likes post #25 answers the question as asked. The question underneath it is different. Renal function markers: eGFR is estimated, not measured. It depends on creatinine, age,…
Type 2 diabetes and the largest part of the evidence base — does this still hold? Replied, post #8 · marked as the solution · Clinical › Comorbidities · 8 May 2026 · 8 likes PCOS and metabolic overlap: polycystic ovary syndrome has metabolic overlap with obesity and insulin resistance. Data on compounds in this class in PCOS specifically is…
Spreadsheets: an appreciation — what changed since Replied, post #32 · Lounge › Off topic · 2 May 2026 · 0 likes Humour: light, relevant humour is welcome. Cruel humour targeting individuals or groups is not.
Reused chromatograms across lots: how to spot it Replied, post #38 · Analytics › COA interpretation · 2 May 2026 · 9 likes post #37 is right about the mechanism and I think understates the practical bit. Reading old certificates: if a certificate is dated years ago, the lot it describes…
Bug report: the reconstitution calculator and a rounding edge case Replied, post #42 · Data & Tools › Calculators · 7 Apr 2026 · 4 likes post #41 is right about the mechanism and I think understates the practical bit. Reconstitution calculator: enter vial mass, final volume target, and the calculator…
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #110 · Clinical › Bloodwork · 25 Mar 2026 · 22 likes Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is…
Reading U-100 graduations, with a conversion table Replied, post #17 · Devices › Syringes & needles · 20 Mar 2026 · 6 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Coming back to: Semaglutide in people without diabetes: what the evidence base looks like Replied, post #41 · Compounds › Semaglutide · 17 Mar 2026 · 0 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Coming back to: Training through a dose escalation week Replied, post #34 · Nutrition & Training › Resistance training · 21 Feb 2026 · 4 likes post #33 is right about the mechanism and I think understates the practical bit. Deload weeks: periodic weeks (every 4 to 8 weeks) with reduced volume and intensity can…
When to stop reading forums, including this one Replied, post #87 · Wellbeing › Mental health · 8 Feb 2026 · 11 likes On post #83 — agreed on the reasoning, with one qualification. Disordered eating history: a history of anorexia, bulimia, or other eating disorders changes the…
Stepping down deliberately, and how to do it without losing progress Replied, post #51 · Practice › Dosing & titration · 31 Jan 2026 · 16 likes When a dose reduction is the correct response to a side effect: if a side effect is dose-dependent (nausea, constipation, injection discomfort), reducing the dose is a…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #130 · Compounds › Oral incretins · 5 Jan 2026 · 0 likes Why an oral formulation is a formulation achievement: the molecule is the same but the tablet is novel. Getting a peptide across the gastric epithelium at usable…
Why the titration planner refuses to produce a schedule below a floor Replied, post #21 · Data & Tools › Calculators · 23 Dec 2025 · 26 likes Mass error checking: enter your observed mass and theoretical mass and check whether the difference in ppm is within reasonable bounds for your instrument. Useful…
DXA precision and the least significant change for lean mass Replied, post #35 · Outcomes › Body composition · 1 Dec 2025 · 25 likes Maintenance phase: tracking body composition during maintenance (weight stable) is different from tracking during active loss. Changes are smaller and precision becomes…
Comparing my trajectory with the trial curves, carefully Replied, post #81 · Outcomes › Progress reports · 25 Nov 2025 · 0 likes post #80 is right about the mechanism and I think understates the practical bit. Protein intake and resistance training: both self-reported and therefore optimistic in…
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #39 · Practice › Reconstitution · 24 Nov 2025 · 4 likes Foaming during reconstitution: bubbles in the solution are usually just air incorporated during mixing. They usually resolve with gentle warming and time. Persistent…
Tracking that stops updating and then resumes — the long version Replied, post #37 · Sourcing › Logistics · 12 Nov 2025 · 10 likes Picking up post #34: that is the part I would want checked first. Customs outcomes are not predictable at the level of an individual parcel. What is predictable is that…
Sleep tracking data and its considerable limitations Replied, post #91 · Wellbeing › Sleep · 26 Oct 2025 · 9 likes This follows post #88 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Power cut for eleven hours: how I assessed it afterwards Replied, post #101 · Practice › Storage & stability · 18 Oct 2025 · 2 likes Worth separating two things that post #97 runs together. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did…
Reconciling a supplier certificate with an independent result Replied, post #2 · Sourcing › Vendor reports · 7 Oct 2025 · 23 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Follow-up: The decimal-point error, and the habit that catches it Replied, post #60 · Practice › Reconstitution · 15 Sep 2025 · 7 likes Arithmetic step by step: a 5 mg vial with 2 mL of diluent gives (5 mg) / (2 mL) = 2.5 mg/mL. On a U-100 syringe at that concentration, 100 units = 1 mL = 2.5 mg, so…
Enforcement priorities versus written rules — does this still hold? Replied, post #23 · Sourcing › Regulatory · 22 Aug 2025 · 0 likes Primary documents matter: regulatory positions are published in official documents. Reading the regulatory agency's website directly is more reliable than reading a…
Revisiting: Filter needles: when they help and what they cost you Replied, post #47 · Devices › Syringes & needles · 19 Aug 2025 · 13 likes Dead volume: residual liquid in the hub and needle after withdrawal. Typical residual is 0.01 to 0.02 mL for an insulin syringe with a fixed needle. Accounting for it…
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #58 · Compounds › Secretagogues & GH axis · 12 Aug 2025 · 6 likes On post #54 — agreed on the reasoning, with one qualification. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what…
Which panel is worth repeating and which is worth ignoring Replied, post #78 · Clinical › Bloodwork · 6 Aug 2025 · 1 like Coming back to post #76, because the follow-up matters more than the original answer. TSH and free hormones: TSH is a reasonable screening test but does not tell you…
Immortal time bias in a claims-database study Replied, post #12 · Evidence › Study critique · 3 Aug 2025 · 0 likes Coming back to post #10, because the follow-up matters more than the original answer. Bias towards the null and bias away from the null: different criticisms have…
A ten-fold dose error caught before injection — one year on Replied, post #71 · Devices › Syringes & needles · 3 Aug 2025 · 2 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #52 · Access › Insurance & coverage · 21 Jul 2025 · 28 likes This follows post #49 rather than contradicting it. Reimbursement changes: a compound covered one year might not be the next. A formulary decision in January can change…
Coming back to: Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #40 · Compounds › Cagrilintide & amylin analogues · 10 Jul 2025 · 22 likes Historical amylin analogues: pramlintide was the only long-acting amylin analogue licensed for some time and its poor adherence was a known limitation. A weekly…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #136 · Devices › Cold chain · 5 Jul 2025 · 9 likes Picking up post #133: that is the part I would want checked first. Reconstituted solutions: once reconstituted, solutions are less stable than lyophilised powder.…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #19 · Documentation › Doc review · 30 Jun 2025 · 11 likes Worth separating two things that post #15 runs together. Citation checking: if a maintained page cites a paper, the citation should match what the paper actually says.…
Antibiotics and a course of something with delayed emptying Replied, post #49 · Practice › Interactions · 25 May 2025 · 1 like Sulfonylureas and meglitinides: these agents stimulate insulin release and carry hypoglycemia risk. Combining them with semaglutide or tirzepatide requires dose…
Coming back to: Over-dilution: when your dose falls below one readable graduation Replied, post #8 · Practice › Reconstitution · 30 Apr 2025 · 0 likes Osmolarity and reconstitution: the osmolarity of the reconstituted solution affects comfort on injection. Isotonic solutions (close to blood osmolarity) are less…
Revisiting: Oral versus injected administration claims for BPC-157 Replied, post #25 · Compounds › Repair & healing peptides · 28 Apr 2025 · 2 likes Analytical identity of BPC-157: a 15-residue peptide with an unambiguous mass (≈1419.5 Da). Identity confirmation by LC-MS is trivially easy, which means there is no…
When a preprint is the best available evidence and we say so — a second dataset Replied, post #20 · Evidence › Preprints · 23 Apr 2025 · 6 likes Do not build anything on a preprint that you would mind rebuilding: if the preprint later changes substantially in revision or shows different results when published,…
Retatrutide dose escalation in the published trials Replied, post #156 · Compounds › Retatrutide · 19 Apr 2025 · 8 likes I read post #154 twice before replying, because I had assumed the opposite. How to read phase 2 without treating it as phase 3: phase 2 establishes that a dose range…
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #12 · Devices › Pens & autoinjectors · 4 Apr 2025 · 19 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Second pass at: A history of disordered eating: proceeding carefully Replied, post #12 · Wellbeing › Mental health · 1 Mar 2025 · 0 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
Oxidation and deamidation mass shifts, tabulated Replied, post #32 · Analytics › Mass spectrometry · 7 Jan 2025 · 0 likes Quantitation by MS: most quantitation is done by LC-UV detection at 214 nm, not by MS, because extinction coefficients are better known. MS can quantify if an internal…
[2026 update] How to read a forest plot, properly, from scratch Replied, post #32 · Evidence › Trials · 13 Dec 2024 · 24 likes Surrogate endpoints: an endpoint that is not the outcome that matters but is measured as a stand-in. HbA1c is a surrogate for long-term glucose control and the…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #86 · Clinical › Bloodwork · 6 Oct 2024 · 12 likes Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #125 · Nutrition & Training › Hydration & electrolytes · 30 Sep 2024 · 10 likes Picking up post #122: that is the part I would want checked first. I disagree with the reply above, and I think the disagreement is substantive rather than…
Revisiting: Joined after a search result and stayed Replied, post #2 · Lounge › Introductions · 23 Sep 2024 · 14 likes the opening post is right about the mechanism and I think understates the practical bit. Community culture: introductions give you a sense of who is here. Reading a few…
When a red flag was a misunderstanding, and the retraction Replied, post #7 · Sourcing › Red flags · 25 Aug 2024 · 0 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 #77 · Sourcing › Logistics · 6 Jul 2024 · 12 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
How this community labels and discusses unrefereed work Replied, post #23 · Evidence › Preprints · 16 Jun 2024 · 0 likes Preprints for speed: some important preliminary findings are posted as preprints to disseminate quickly. That speed is useful but comes at the cost of not yet having…