d.nilsen
TL2 Moderator · Bari
Contributes reviews on supplier material. Based in Bari.
Joined 15 December 2024 · last posted 2d
71Posts here
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A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #157 · Practice › Reconstitution · 2 Nov 2025 · 33 likes Arithmetic step by step: a 5 mg vial with 2 mL of diluent gives (5 mg) / (2 mL) = 2.5 mg/mL. On a U-100 syringe at that concentration, 100 units = 1 mL = 2.5 mg, so…
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Revisiting: The report format the maintainers ask for, and why each field is there Replied, post #37 · Sourcing › Vendor reports · 18 Mar 2026 · 32 likes I read post #35 twice before replying, because I had assumed the opposite. Blind submission is worth the effort: have someone else relabel the sample so neither you nor…
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A supplier who responds to a discrepancy with silence — what changed since Replied, post #71 · Sourcing › Red flags · 28 Jun 2026 · 30 likes Documentation quality as a signal: a supplier that reports method identifiers, distinguishes specification from result, and states the counter-ion form is telling you…
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Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #54 · Practice › Administration · 12 Jun 2026 · 30 likes post #53 answers the question as asked. The question underneath it is different. Leak-back after withdrawal: a small amount of liquid on the skin after withdrawal is…
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Second pass at: Certificates issued by the seller versus by a laboratory Replied, post #52 · Analytics › COA interpretation · 24 Jan 2025 · 30 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
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Spike-and-recover accuracy for a peptide assay Replied, post #65 · Analytics › Method validation · 9 Apr 2026 · 28 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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Badges earned, in order
| Badge | Tier | Granted |
|---|---|---|
| First Reply | bronze | 18 Dec 2024 |
| Basic User | bronze | 19 Dec 2024 |
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| First Link | bronze | 22 Dec 2024 |
| Member | bronze | 2 Jan 2025 |
| First Topic | bronze | 6 Jan 2025 |
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| Nice Post | bronze | 19 Feb 2025 |
| Sourced | bronze | 5 Apr 2025 |
| Editor | bronze | 29 Apr 2025 |
| Good Post | silver | 25 Jul 2025 |
| Anniversary | silver | 15 Dec 2025 |
| De-escalator | gold | 25 Feb 2026 |