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ForumsCOA & Analytical TestingHow to read a Certificate of Analysis — complete guide Page 19

How to read a Certificate of Analysis — complete guide

COA_Karl Mon, Feb 26, 2024 at 4:00 PM 245 replies 11,691 viewsPage 19 of 20
dave_SLC
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Apr 4, 2024 at 8:58 PM#91

One concrete data point for the thread. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.

33 6mike_mealprep, NicoleRaleigh, james_edin and 30 others
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CanadaChris
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Nov 2024
Toronto, CA
Apr 5, 2024 at 7:58 AM#92

Following on from Dr.RenalNash — and this may be the naive question:

Was that from a primary source or from a summary of one?

34 7stefan_berlin, Dr.EM_Chicago, pete_RVA and 31 others
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Dr.DermMIA
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May 2024
Miami, FL
Apr 5, 2024 at 6:58 PM#93
dave_SLC said:
Practical: whatever you change, write down the date and the reason.

This is where I part company with the consensus forming above. I would resist the confidence. Half of what this board was certain about two years ago has since been quietly dropped, and nobody went back to correct the threads.

Last edited: Apr 5, 2024 at 8:58 PM
35 8A1cHero_PHX, Dr.RenalNash, LipidDoc_ATL and 32 others
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Sigma-Aldrich — Research-Grade Standards

Certified reference materials, analytical reagents, and research-grade standards for peptide verification. Trusted by laboratories worldwide.

Shop Reference Standards
sarah_TO
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Sep 2024
Toronto, CA
Apr 6, 2024 at 5:58 AM#94
dave_SLC said:
Practical: whatever you change, write down the date and the reason.

Agreed, and one caution: a single measurement is not a measurement. Anything that moves day to day needs a trend before it means anything at all.

36 9carl_compliance, DanielChem_CHI, marco_milano and 33 others
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RickReta_CO
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Jan 2025
Colorado
Apr 6, 2024 at 4:58 PM#95
dave_SLC said:
Practical: whatever you change, write down the date and the reason.

Bookmarking. The distinction being drawn above is the one nobody else makes.

37 10LindaRN_retired, tommy_boulder, hyun_seoul and 34 others
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