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c/bloodwork·posted 9 months ago by u/anders_vermeulen

three years of bloodwork threads, summarised so you do not have to read them

Baseline

three years of bloodwork threads, summarised so you do not have to read them. I have gone back and forth on this for months.

Different laboratories use different assay platforms with different calibration. Comparing across labs adds a systematic offset that is invisible on the report.

Reference intervals are typically the central 95% of a reference population. By construction one person in twenty falls outside one on any given test without anything being wrong.

ApoB counts atherogenic particles rather than the cholesterol they carry, which is why it can diverge from LDL-C and why it is the addition most worth making.

That is everything I have. The rest is opinion and I have tried to keep it out.

252 up / 32 down89% upvoted18 commentsid 1rripk24 Oct 2025

18 comments

15 in this archive, depth 4

best — the order this archive was captured in

u/coldchain_karencold chain16 points·9 months ago

Substantial weight loss independently moves lipids, liver enzymes and several other markers. Attributing a change to a compound while losing weight is confounded by design.

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u/anders_vermeulenOP19 points·9 months ago

Tracked triglycerides against the weight trend for a year. The correlation was much weaker than I expected and that was worth knowing.

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u/forest_plot_fionastats9 points·9 months ago

Time of day, fasting state, hydration and recent exercise all move common markers. Standardising the draw conditions is free and it removes most of the apparent variability.

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u/liver_enzyme_liz5 points·9 months ago

do not change three things and then read the panel

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[removed]4 points·9 months ago

[removed by moderator]

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u/amara_dziedzic3 points·9 months ago

That is a non-fasting value and the interval you are comparing it against is a fasting one.

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u/employer_carveout2 points·9 months ago

I would not draw a line through two points, especially when the second was taken at a different time of day.

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u/kenji_kimani1 point·9 months ago

Careful — that is a question for whoever ordered the panel, and nobody in this thread can answer it responsibly.

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u/jonas_cardoso5 points·9 months ago

Did anything else change in that window — training, intake, hydration?

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u/gentle_correctionMOD2 points·9 months ago

Retitled — the original asserted a causal claim the post does not support.

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u/cold_chromatogram313 points·9 months ago

Same lab as the previous draw?

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u/osman_eriksen4 points·9 months ago

one measurement is a point, two is a line, three is a trend

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u/rekha_mwangi-5 points·9 months ago

Repeat testing before acting is standard practice for a reason: regression to the mean does a lot of work on single outlying values.

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u/tidy_vialdrawer_watch1 point·9 months ago

nothing on this board interprets your results for you

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About c/bloodwork

What to measure before you start, what to re-measure, and how to interpret movement without panicking. ApoB over LDL-C, HOMA-IR as a crude free tool, ALT and the fatty-liver story, eGFR noise during rapid loss, and the deficiencies that a 1,100-calorie appetite will hand you.

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