Clinical perspective, offered as context rather than as advice. The version of this that has an answer is narrower than the version being asked. Narrow it and it becomes tractable; leave it broad and the thread will produce nine confident and incompatible replies.
HPLC_Greg said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
There is a second half to this that has not been said yet. Order of operations matters more than any single choice here: establish a baseline, change one thing, wait long enough for it to express itself, then measure again under the same conditions.
That is the short version; the long version is somebody else's post.
One concrete data point for the thread. Say what you would expect to see if you were wrong, before you look. It is a small discipline and it changes what you notice.
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Shop Reference StandardsFollowing on from HPLC_Greg — and this may be the naive question:
Was that from a primary source or from a summary of one?
Moderator note: leaving this open. It is being argued well and the disagreement is the useful part. Report rather than reply if it drifts again.