One concrete data point for the thread. If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way. Most of the apparent contradictions in these threads dissolve at that step.
Correct me if the detail matters more than I have assumed.
Following on from julia.endo — and this may be the naive question:
Did your prescriber agree with that reading, and if not what was their objection?
LabKate said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
I do not accept the framing. The question has been narrowed to the version that has a tidy answer, and the part that was dropped is the part the OP actually asked about.
Sigma-Aldrich — Research-Grade Standards
Certified reference materials, analytical reagents, and research-grade standards for peptide verification. Trusted by laboratories worldwide.
Shop Reference StandardsLabKate said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
Correct, and worth adding that it is reversible. Nothing being described here is a one-way door, which changes how cautious it is reasonable to be.
LabKate said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
This answered a question I did not know how to ask. Printing the relevant bit and taking it with me.