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c/coa·submitted 3 months ago by u/sofia_ferreira

[Question] New Zealand — has anyone got a straight answer on certificate of analysis

Questionbranch of 4 comments

Long-ish post, sorry. tl;dr at the bottom. I have been tracking COA against eGFR for 33 weeks because I could not find anyone who had. The correlation is weaker than I expected, which is itself mildly interesting given how confidently people link the two in here. Caveats up front: one person, one lab, one assay, no…

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4 comments, started 3 months ago
u/teodor_lokken26 points·3 months ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

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u/katrin_girard16 points·3 months ago

PDF metadata is checkable in fifteen seconds

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u/yusuf_nakamura5 points·3 months ago

This is the correct framing. The COA structure matters as much as the number.

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u/clara_danquah-9 points·3 months ago

Water content on the document? That affects your concentration math.

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How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

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