Topic summary

Fasting versus non-fasting and which tests care

Clinical › Bloodwork eGFR & renal function lipase & amylase HbA1c Solved

This is a generated summary. It shows the 9 most-liked posts from a topic of 79, 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.

k.redgraveTL2Member Solution1 Apr 2026#6

j.fonseca, post #1: Fasting versus non-fasting and which tests care Writing it up because I had to work it out twice and would rather nobody else did. General question, not a request for advice about my own care — I know the difference and I would rather be told to see my prescriber than get an answer that pretends otherwise. I have a panel in front of me… Go to post

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.

8 likes in reply to #1 4mo

a.cabreraTL2 Moderator3 Apr 2026#7

Coming back to post #5, because the follow-up matters more than the original answer.

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.

33 likes 4mo

e.kjeldsenTL2Member24 Apr 2026#17

This follows post #14 rather than contradicting it.

Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is comparing things that are not the same.

30 likes 3mo

hana.satoTL4 Moderator12 May 2026#27

Staff post. Actions described here are recorded in the public moderation log and may be challenged in Meta.

Coming back to post #25, because the follow-up matters more than the original answer.

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.

25 likes 3mo

dr_bhattacharyaTL3Physician28 May 2026#37

For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.

27 likes 2mo

sharps_binTL2Regular8 Jun 2026#44

post #43 answers the question as asked. The question underneath it is different.

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.

26 likes 2mo

journalclub_wrenTL3Regular27 Jun 2026#57

Picking up post #54: that is the part I would want checked first.

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

32 likes 1mo

j.mwangiTL4 Moderator5 Jul 2026#63

31 likes 23d

v.klausenTL3Regular15 Jul 2026 · edited#70

post #69 answers the question as asked. The question underneath it is different.

HbA1c and glucose: HbA1c reflects average glucose over months; a spot glucose measurement reflects the moment. Trending glucose downward while HbA1c stays flat is a different picture than glucose going up with HbA1c.

33 likes 13d

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