Clinical perspective, offered as context rather than as advice. It helps to say which part of this you are uncertain about. A precise question gets a precise answer; a general one gets everybody’s favourite anecdote.
stefan_berlin said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
stefan_berlin has the substance of this right. The condition it depends on is worth stating. Yes, and the corollary is less popular: if the reasoning holds, it also holds where it produces an answer we do not like.
Happy to go further on any of that.
stefan_berlin 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. Sending this to two other people who asked me the same thing last week.
Certified reference materials, analytical reagents, and research-grade standards for peptide verification. Trusted by laboratories worldwide.
Shop Reference StandardsAdding the clinical framing, because it changes how the question reads. The useful move here is to separate what is established from what is widely repeated. Those two sets overlap less than the confident tone of most write-ups suggests, and the second set is where nearly all the disagreement on this board comes from.
Moderator note: two posts asking for a source have been merged into one. Please search the thread before asking again. Tagging this one for the weekly digest.