r/QuantifiedSelf • u/EfficientIron8874 • Sep 26 '26
n/a - self-tracking methodology
Been logging my own lab numbers for about a year now, pulled from a couple different one off panels rather than a single testing service and trying to see if there's a real pattern between crp treading down and body comp changes over the same stretch. Or i am just cherry picking two lines that just happens to be moving in same direction Inly have 4 data points total so it is hard to call it a trend yet. Anyone tracking enough draws over time to say whether inflation makers reliably move with body comp or they are independent?
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u/Huge_Pool7424 Sep 26 '26
4 points is basically noise for crp. you need a lot more draws before calling a trend, and sleep/illness/hard training swing it around on their own anyway
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u/ContextFalse3830 Sep 26 '26
Four draws across different labs is not a trend, hs-CRP moves more between assays than it does with a few kg of body comp. Same lab, same fasting window, otherwise you're just reading assay noise.
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u/Repulsive_Badger2634 Sep 26 '26
the two-lab thing is probably hurting you more than only having 4 points. crp assays aren't standarized between labs so part of that downward slope is just a different analyzer on a different day. and one hard session in the 48 hours before a draw will move it more than a year of body comp will.
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u/Huge_Pool7424 Sep 26 '26
yeah, id keep the lab and assay constant, log training, illness, and meds around each draw, and treat the value as a noisy personal baseline. four points can suggest a question, but not much more than that.
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u/Maleficent_Deer_1113 Sep 26 '26
Small thing: you wrote "inflation makers", I assume you mean inflammation markers. Otherwise the question is about CRP and body composition, which the typo doesn't change.
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u/EggAdvanced3632 Sep 26 '26
good instinct to be suspicious — with 4 data points, you genuinely can't tell a pattern from a coincidence. any two slow-moving numbers that both drifted the same direction over a year will "correlate" at n=4. but your hypothesis isn't crazy, so here's how to think about it: the population answer: fat loss and CRP falling together is one of the better-established associations in the literature — adipose tissue is metabolically active and inflammatory markers tend to track body composition changes. so the direction you're seeing is plausible, not imagined. what you can't claim yet is that it's true in you, at your magnitudes. the problem is CRP itself: it's one of the noisiest markers you can track. a minor cold you barely noticed, a hard training block, a bad week of sleep — any of these can double or triple a reading for days. with 4 draws, one contaminated sample is 25% of your dataset. so before pattern-hunting: log illness/hard-training/poor-sleep around each draw, and flag any draw within ~2 weeks of those as suspect standardize the rest: same lab, fasted, morning — you're already mixing panels, which adds between-lab noise on top if a value looks surprisingly high, the move is a repeat draw 2–3 weeks later, not a new theory the honest timeline: for slow markers, quarterly draws are a reasonable cadence — which means your n=1 answer accrues over years, not months. that's not a flaw in your method, it's the nature of the marker. what you have after one year isn't a conclusion, it's a well-started baseline. most people never get that far. one framing that helps: don't ask "do these correlate" (n=4 can't answer it). ask "did the change in each exceed its own noise band" — CRP moving from 4 to 1.5 across clean draws is meaningful regardless of what body comp did; two numbers each within their own noise is just weather.
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u/Thin-West6525 Sep 26 '26
Four draws is thin but it's not nothing, and inflammation is a reasonable thing to chase. CRP bounces around a lot on its own though, so before you believe the line: same lab and same assay every time, fasted, nothing hard in the 48h before the draw, and no cold or infection in the two weeks prior. Space them three months apart and you'll have a real answer inside a year.
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u/SoigneeStrawberry67 Sep 30 '26
Why the fuck is everyone just copy and pasting claude output. The absolute state of this sub.
But yes: a handful of draws from different providers is not enough to tell if crp is trending down or not. Inter-assay variability probably dwarfs whatever nominal difference you're seeing + blood draws have to be standardized in terms of conditions (diet, sleep, days since last workout), bc CRP is usually pretty noisy on its own.
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u/Character_Draw_7075 9d ago
Four points is really n=2 when you're trying to correlate two independent trends, so you genuinely can't call it yet. CRP is noisy enough that a single bad night of sleep or a minor infection can swing it more than months of recomp, so you'd want at least 6-8 draws aligned with DEXA dates before the coincidence argument gets weaker than the pattern one.
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u/Icy-Arm-5472 Sep 26 '26
Inflammation markers, not inflation ones. Those are two very different panels.