m.steiner
TL2 Moderator · Ghent
Contributes reviews on supplier material. Based in Ghent.
Joined 2 July 2025 · last posted 6d
82Posts here
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Mass error in ppm: the arithmetic and the caveat Replied, post #107 · Analytics › Mass spectrometry · 15 Feb 2026 · 32 likes Picking up post #104: that is the part I would want checked first. Tandem mass spectrometry: MS/MS fragments the molecular ion and uses fragment masses to confirm…
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Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #16 · Data & Tools › Calculators · 2 Jun 2025 · 31 likes Offline use: all calculators are written in JavaScript and can be downloaded and run offline if desired. They do not require internet connectivity to function.
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DXA precision and the least significant change for lean mass — the long version Replied, post #62 · Outcomes › Body composition · 19 May 2025 · 30 likes On post #58 — agreed on the reasoning, with one qualification. DXA (dual-energy X-ray absorptiometry): the standard for body composition in research. Precision is…
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Spike-and-recover accuracy for a peptide assay Replied, post #34 · Analytics › Method validation · 8 Apr 2026 · 29 likes Accuracy: the method measures what you intend to measure. For purity methods, this is tested by spike-and-recover experiments: add a known amount of impurity to a…
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Second pass at: A single out-of-range value on an otherwise normal panel Replied, post #7 · Clinical › Bloodwork · 22 Feb 2025 · 29 likes Lipid panel interpretation: total, LDL, HDL, triglycerides all on one panel. Reading them together is more informative than reading one value in isolation. An elevated…
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Time to steady state after a dose increase Replied, post #63 · Pharmacology › Pharmacokinetics · 4 Nov 2024 · 29 likes Volume of distribution: the theoretical volume the drug distributes into. For albumin-binding compounds, volume is reduced compared to drugs that do not bind protein.…
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