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c/bloodwork·posted 7 months ago by u/micro_bump_mick

week 31 check-in — 11kg down, sulphur burps manageable, one thing confusing me

Baseline Well Actually ×1 Sourced ×3

week 31 check-in — 11kg down, sulphur burps manageable, one thing confusing me, logged the same way every week so the comparison is at least internally fair.

The relevant figures are week 31 and 11kg, and they come from the same log I have kept the whole time.

Nobody here can interpret your panel and this comment is not doing so. What a board can usefully do is help you ask better questions of somebody who can.

My TSH moved and I spent a fortnight convinced I knew why. The repeat six weeks later was back in range and I had changed nothing.

Corrections welcome, especially the pedantic ones. Pedantry is how this board earns its reputation.

1,145 up / 200 down85% upvoted41 commentsid nt3xo5 Dec 2025

41 comments

28 in this archive, depth 4

best — the order this archive was captured in

u/coa_forgery_watch129 points·7 months ago

Why so many single values look alarming and turn out to be nothing.

A reference interval is built to contain about 95% of a healthy reference population, so one test in twenty falls outside one by construction. Add biological variation, assay imprecision, fasting state and time of day, and a genuinely stable person will produce occasional out-of-range results.

That is why repeat testing before acting is standard. Regression to the mean handles most of it. None of which means an out-of-range value should be ignored — it means it should be repeated and taken to somebody who can put it in context, which is emphatically not a ranked feed.

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u/micro_bump_mick-21 points·7 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/heart_rate_bump101 points·7 months ago

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.

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u/hedda_adeyemi29 points·7 months ago

Yes — same lab, same fasting state, same rough time of day, or the comparison is doing nothing.

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u/thyroid_tangent24 points·7 months ago

Added ApoB to the panel after a thread here. It told me something the standard lipid panel had been hiding.

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u/diego_almeida80 points·7 months ago

same lab, same conditions, or you are comparing noise

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u/neha_rahimi63 points·7 months ago

Brought the whole set to my clinician rather than one flagged value. Completely different conversation.

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u/janek_ferrari34 points·7 months ago

How many weeks between the two measurements?

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u/noor_cardoso16 points·7 months ago

Yes. Repeat before you react. Almost every alarming single value I have posted here regressed on the repeat.

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u/lina_falk12 points·7 months ago

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.

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u/liver_enzyme_liz5 points·7 months ago

fasting state and time of day change more than people expect

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u/noor_cardoso13 points·7 months ago

Tracked fasting insulin 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/karl_fischer_kev10 points·7 months ago

How to make a panel worth comparing, which is most of the value people leave on the table.

Standardise the conditions: same lab, same fasting state, same rough time of day, same point in the week, similar hydration. Take a baseline before you change anything. Repeat any surprising value before acting on it. Change one thing at a time if you want to attribute anything to it.

Do that and a year of panels is a trend. Skip it and a year of panels is a collection of unrelated mornings, which is what most of the alarmed posts here are actually describing.

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u/micro_bump_mickOP22 points·7 months ago

draw at the same point in the week if you want comparability

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u/coldchain_karencold chain7 points·7 months ago

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

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u/baseline_drifteranalytical10 points·7 months ago

Same view — ApoB if you add one thing. It answers a question the standard panel only gestures at.

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u/nabila_bakken3 points·7 months ago

Cosigning on baseline. The panel I regret most is the one I did not take before starting.

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u/step_therapy_s29 points·7 months ago

Panicked about a single result, posted here, got told to repeat it, repeated it, and it was fine.

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u/yara_boateng7 points·7 months ago

do not change three things and then read the panel

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u/micro_bump_mickOP4 points·7 months ago

Small fix — a reference interval is not a treatment target, and the post above uses them interchangeably.

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u/osman_eriksen2 points·7 months ago

Small fix — a reference interval is not a treatment target, and the post above uses them interchangeably.

Adding the obvious one — take it to whoever ordered the panel. This board cannot read it for you.

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u/cormac_erdogan0 points·7 months ago

That comparison crosses two labs with different assays. The difference you are describing may be the method.

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u/lina_falk1 point·7 months ago

This. Reference ranges are population intervals, not targets, and conflating them causes a lot of unnecessary alarm here.

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u/andres_restrepo1 point·7 months ago·edited

Draw at the same point in the week now, fasting, same lab. The noise dropped enormously once I standardised.

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u/freya_baptista1 point·7 months ago

Right, and weight loss itself moves several markers, so attribution is harder than these threads assume.

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u/baseline_drifteranalytical1 point·7 months ago

Same lab as the previous draw?

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u/micro_bump_mickOP1 point·7 months ago

ApoB is the one worth adding if you only add one

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u/tidy_vialdrawer_watch1 point·7 months ago

hydration status moves a surprising number of markers

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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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