q.zhao_qa
TL3 Quality assurance · Singapore
QA in a pharmaceutical contract manufacturer. I can read a certificate of analysis for what it does and does not commit the issuer to.
Joined 12 February 2025 · last posted 2d · groups: analytical-chemists, wiki-editors
159Posts here
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Pre-registering a personal experiment, seriously — a second dataset Replied, post #55 · Research Methods › N-of-1 designs · 13 Apr 2026 · 32 likes Regression to the mean explains a great many personal experiments. People start when things are at their worst, and things at their worst tend to improve.
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The most useful thing you learned here that was not the answer you came for — a second… Replied, post #28 · Lounge › Off topic · 9 Sep 2025 · 32 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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Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #50 · Documentation › Doc review · 24 Jul 2026 · 30 likes Where a review raises something the author disagrees with, recording the disagreement in the review thread is better than resolving it privately.
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What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #28 · Compounds › Semaglutide · 15 Jan 2025 · 30 likes Injection site does not appear to matter much for semaglutide exposure. The published comparisons of abdomen, thigh and upper arm found differences small enough to be…
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Racemisation and why it is invisible to a mass measurement Replied, post #127 · Analytics › Impurities & related substances · 15 Jun 2026 · 29 likes Truncation products are substantially lower in mass and usually well separated chromatographically, which makes them the easiest class to see and the least likely to be…
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Fixed versus detachable needles: the trade-offs Replied, post #60 · Devices › Syringes & needles · 20 Dec 2024 · 29 likes A detachable luer needle plus hub can retain enough volume to matter. Whether it matters to you depends on your dose, and the arithmetic is worth doing once.
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