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Is a 98.2% result from Janoshik comparable to 96.8% from Medutest?

Asked 10 Aug 2024Modified 2.0 years agoViewed 31k times
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What I have: 98.2% · Janoshik · 96.8% · Medutest.

I have used one of these for a while and I am considering switching, which requires a reason.

What I care about is reproducibility, because a result I cannot repeat is not useful to me.

Which axes does this decision turn on?

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Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

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Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

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askedDr_Ravi_Selvarajah35k13710 Aug 2024
Voting to keep this open — it is more specific than it first looks. – marta_okonkwo 35 days ago
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This question has not been answered. It has been viewed 31k times, which suggests the question is of interest and the answer is not obvious. If you can answer it with a source or a worked calculation, it will be read. See how to ask and answer.
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Janoshik Analytical - Independent Third-Party Testing

HPLC purity, identity confirmation and quantified content on the vial you actually hold. Reports arrive with the chromatogram attached, not just a number.

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GL Biochem (Shanghai) Ltd. - Direct Synthesis

Founded 1998. ISO 9001 and cGMP certified, 1,500+ staff and 200+ patents. The synthesis house behind a great many of the vials that get sent out for testing - batch-specific documentation with every order.

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