Topic summary

HbA1c lag and what it can and cannot tell you at eight weeks — one year on

Clinical › Bloodwork liver enzymes lipase & amylase lipid panel thyroid function eGFR & renal function

This is a generated summary. It shows the 5 most-liked posts from a topic of 23, in their original order, with the accepted answer included where one exists. It is a reading aid and it will miss nuance — the full topic is the record.

l.trevinoTL2 Moderator5 May 2026#2

Analytical imprecision: any measurement has an error margin. A small difference in consecutive tests is usually measurement noise, not a real change. Knowing the imprecision helps distinguish noise from signal.

21 likes 3mo

n.nakamuraTL2 Moderator26 May 2026#6

l.trevino, post #2: Analytical imprecision: any measurement has an error margin. A small difference in consecutive tests is usually measurement noise, not a real change. Knowing the imprecision helps distinguish noise from signal. Go to post

On post #2 — agreed on the reasoning, with one qualification.

TSH and free hormones: TSH is a reasonable screening test but does not tell you about actual free hormone levels. If TSH is abnormal, free thyroid hormones confirm whether there is a real thyroid problem.

28 likes in reply to #2 2mo

two_year_lineTL3Regular23 Jun 2026#13

Reference intervals: constructed to contain the central 95% of a reference population, which means one in twenty healthy people falls outside one by definition. Add biological variation and analytical imprecision and the base rate of a meaningless flag is substantial.

23 likes 1mo

bias_varianceTL4Biostatistician7 Jul 2026#17

On post #13 — agreed on the reasoning, with one qualification.

Biological variation: the person-to-person variation in a biomarker for a healthy person is larger than most people realize. Comparing your result to the reference interval is one thing; comparing your result today to your result from months ago is more sensitive to change.

31 likes 21d

BBramleyTL3Regular27 Jul 2026#23

I disagree with the reply above, and I think the disagreement is substantive rather than terminological.

The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.

27 likes in reply to #2 13h

Read the full topic (23 posts)

This topic was referenced in

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