n.abernathy
TL3 Analytical chemist · Raleigh, NC, US
QC analyst. I do a lot of "your acceptance criteria are not the same as their acceptance criteria" in this forum.
Joined 22 July 2024 · last posted 2d · groups: analytical-chemists
155Posts here
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Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #95 · Compounds › Retatrutide · 26 Jul 2026 · 28 likes I had written a reply contradicting post #91 and deleted it. Here is what survived. Retatrutide discussion is a question about a distribution, not about a value, and…
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[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #120 · Sourcing › Independent verification · 24 Jul 2026 · 2 likes On post #116 — agreed on the reasoning, with one qualification. Where I have landed on Interpreting a result, having got it wrong once in public: the direction is…
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eGFR fluctuation and the creatinine denominator problem Replied, post #3 · Clinical › Bloodwork · 22 Jul 2026 · 1 like Egfr fluctuation looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.
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Comparing my trajectory with the trial curves, carefully — a second dataset Replied, post #79 · Outcomes › Progress reports · 22 Jul 2026 · 0 likes If a pattern survives a rolling-mean treatment it is worth explaining. Most do not, and that is the useful finding.
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Prescription portability between countries Replied, post #104 · Access › International · 19 Jul 2026 · 24 likes Answering the question post #100 raises rather than the one it answers. Nothing here is legal advice, and in this subcategory that caveat is doing real work rather than…
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How to ask a question when you cannot say why you are asking it Replied, post #41 · Start Here › How to Ask · 15 Jul 2026 · 0 likes Disagreeing with an answer you got: cite what you disagree with, say what contradicts it, and ask which one holds. Do not open with "I think you are wrong". Lead with…
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Seven-day rolling means and why weekly readings mislead Replied, post #35 · Outcomes › Progress reports · 15 Jul 2026 · 7 likes Taking post #34 at face value and following it one step further. Weighing daily and reporting weekly is a better protocol than weighing weekly, because it separates the…
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Lipid changes during rapid weight loss: the expected trajectory Replied, post #12 · Clinical › Bloodwork · 14 Jul 2026 · 3 likes A trend needs at least three points to be a trend. Two points are a line and a line through noise is still a line. If anyone can point at the primary source I would be…
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Osteoarthritis and mechanical versus metabolic improvement — one year on Replied, post #33 · Clinical › Comorbidities · 11 Jul 2026 · 8 likes Adding a small correction to the Osteoarthritis and mechanical versus metabolic summary above rather than a disagreement with it. The substance holds; one of the…
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0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #99 · Devices › Syringes & needles · 8 Jul 2026 · 0 likes This follows post #96 rather than contradicting it. Reporting rather than recommending, on 0.3 ml versus 0.5 ml. What happened is above. Whether it should have is a…
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Revisiting: The best-written scientific paper you have read Replied, post #76 · Lounge › Off topic · 7 Jul 2026 · 18 likes A digression that keeps occurring to me: the most-linked documents here are the dullest ones. Nothing gets cited like the unit-arithmetic page.
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Why we ask for units every single time, with three examples of what goes wrong Replied, post #106 · Start Here › How to Ask · 7 Jul 2026 · 0 likes Narrowing post #105, because the general version has more than one answer. A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the…