d.ferreira
TL2 · Bochum
Contributes reviews on supplier material. Based in Bochum.
Joined 17 June 2025 · last posted 1d
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[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #74 · Analytics › HPLC & UHPLC · 27 Jul 2026 · 3 likes Before anything else: what was the gradient, and at what wavelength? Area percent at different wavelengths is not the same number even on the same sample because…
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What to bring: records that a clinician can actually use — a second dataset Replied, post #82 · Clinical › Prescriber conversations · 27 Jul 2026 · 1 like Bringing a record of symptoms with dates and severities makes an assessment materially easier and is the single most useful preparation.
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GHRH analogues versus ghrelin mimetics: different mechanisms, conflated discussion Replied, post #53 · Compounds › Secretagogues & GH axis · 26 Jul 2026 · 12 likes Post #51 put the caveat in the right place and I want to underline it. Filing a mild objection to the consensus on GHRH analogues versus ghrelin mimetics. Mild because…
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Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #66 · Compounds › Retatrutide · 16 Jul 2026 · 12 likes Agreed on retatrutide discussion, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does…
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Immortal time bias in a claims-database study — one year on Replied, post #24 · Evidence › Study critique · 15 Jul 2026 · 11 likes Everything in post #20 holds. The case it does not cover is the one I have. What I want from this Immortal time bias thread is the list of things that would need to be…
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Submitting a sample: the process end to end Replied, post #76 · Sourcing › Independent verification · 12 Jul 2026 · 2 likes The record shows what was measured. Everything beyond that is inference and this site tries to keep the line visible. A qualification I should have led with rather than…
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Heart failure with preserved ejection fraction: symptom endpoints Replied, post #18 · Clinical › Comorbidities · 8 Jul 2026 · 0 likes Heart failure with preserved ejection would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.
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How shortages have affected compounding permissions Replied, post #19 · Access › Shortages · 6 Jul 2026 · 32 likes Both are useful and different. The notice tells you the national position; the account tells you what is happening on the ground.
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HbA1c lag and what it can and cannot tell you at eight weeks — one year on Replied, post #16 · Clinical › Bloodwork · 4 Jul 2026 · 0 likes Repeat before acting is standard practice for an isolated abnormal result on most analytes, and it is standard for a reason. If anyone has run this properly I would…
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Personal or family history of medullary thyroid carcinoma Replied, post #32 · Safety › Contraindications · 30 Jun 2026 · 0 likes A history of pancreatitis appears in the cautions and the decision around it needs somebody who knows the history rather than a general rule.
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[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #40 · Access › International · 27 Jun 2026 · 2 likes Coming back to post #38, because the follow-up matters more than the original answer. Country-by-country legality: compound approval and legal status differ…
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A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #127 · Practice › Storage & stability · 10 Jun 2026 · 1 like Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.