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TL2 · Monterrey

Contributes reviews on supplier material. Based in Monterrey.

Joined 20 November 2024 · last posted 10h

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Endotoxin and why it is a separate question from purity — what changed since Replied, post #92 · Analytics › Impurities & related substances · 27 Jul 2026 · 26 likes The arithmetic in post #91 is right; the assumption feeding it is the part to check. That last point is the ceiling on what any purity figure can claim. A method that…
Fasting versus non-fasting and which tests care Replied, post #73 · Clinical › Bloodwork · 19 Jul 2026 · 0 likes Answering the fasting versus non-fasting question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it depends on how…
Reading order for a first week here, and what to skip until later — what changed since Replied, post #20 · Start Here › Welcome · 7 Jul 2026 · 0 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #97 · Evidence › Preprints · 5 Jul 2026 · 0 likes Reading a preprint properly means doing some of the reviewer's job: methods first, then whether the analysis matches the plan, then the conclusion.
Injecting into an area that has become firm: why not to Replied, post #82 · Practice › Administration · 16 Jun 2026 · 0 likes Post #79 is the version of this I will quote in future. One addition. If you have to inject at a different time of day than usual, that is a much smaller perturbation…
Micronutrient adequacy at low total intake Replied, post #93 · Nutrition & Training › Protein & intake · 14 Jun 2026 · 7 likes Fibre and fluid tend to fall alongside protein when intake drops, and the constipation reported here follows from that as much as from the mechanism. I would hold that…
A single out-of-range value on an otherwise normal panel Replied, post #59 · Clinical › Bloodwork · 14 Jun 2026 · 14 likes Coming back to post #57, because the follow-up matters more than the original answer. Repeat before acting is standard practice for an isolated abnormal result on most…
Injecting into an area that has become firm: why not to Replied, post #61 · Practice › Administration · 13 Jun 2026 · 32 likes A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate through them in order, move a minimum 2 cm between consecutive sites,…
Mass error in ppm: the arithmetic and the caveat — a second dataset Replied, post #8 · marked as the solution · Analytics › Mass spectrometry · 12 Jun 2026 · 20 likes Calibration matters: a high-resolution instrument out of calibration can report mass with ppm error large enough to be uninformative. Check when the instrument was last…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #79 · Practice › Reconstitution · 11 Jun 2026 · 13 likes Taking post #76 at face value and following it one step further. Reconstituting the whole vial when you will use a quarter of it is a decision to store the rest in…
A parcel stationary at a customs facility for nine days — does this still hold? Replied, post #25 · Sourcing › Logistics · 5 Jun 2026 · 10 likes I had written a reply contradicting post #24 and deleted it. Here is what survived. Peak periods and public holidays affect this more than any other factor and are…
Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #23 · Analytics › Mass spectrometry · 4 Jun 2026 · 0 likes I had written a reply contradicting post #20 and deleted it. Here is what survived. Summarising the 2 ppm match thread so far, since it is long and the answer is…