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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The decimal-point error, and the habit that catches it Replied, post #113 · Practice › Reconstitution · 18 Dec 2025 · 32 likes Worth separating two things that post #109 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
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Second pass at: Regression to the mean in progress reports Replied, post #30 · Research Methods › Statistics · 20 Jan 2025 · 32 likes Power and sample size: a study might be too small to detect a real effect (low power). Sample size calculations help determine how many participants are needed to…
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Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #61 · Safety › Contraindications · 4 Jun 2026 · 31 likes History of pancreatitis: these compounds can rarely trigger pancreatitis. History of pancreatitis increases relative risk. That is a relative contraindication, not…
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Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #3 · Data & Tools › Datasets · 5 Dec 2025 · 31 likes Using data in discussions: datasets are useful as reference points when someone claims something unusual. "I have not seen that reported in the data" is different from…
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Which panel is worth repeating and which is worth ignoring Replied, post #63 · Clinical › Bloodwork · 18 Jul 2025 · 30 likes TSH and free hormones: TSH is a reasonable screening test but does not tell you about actual free hormone levels. If TSH is abnormal, free thyroid hormones confirm…
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Second pass at: A field-by-field walk through a certificate of analysis Replied, post #88 · Analytics › COA interpretation · 18 Oct 2024 · 29 likes Counter-ion form is crucial: peptides are isolated as salts, most often trifluoroacetate from reversed-phase purification or acetate after salt exchange. The…
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