[Discussion] can we stop arguing about baseline labs until somebody posts a number
Genuine question, and the title is the question: can we stop arguing about baseline labs until somebody posts a number.
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.
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.
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.
Would rather be corrected in public than confident in private.
best — the order this archive was captured in
Different laboratories use different assay platforms with different calibration. Comparing across labs adds a systematic offset that is invisible on the report.
Left up. It is a question about how to compare panels, not a request for interpretation.
Yes. Repeat before you react. Almost every alarming single value I have posted here regressed on the repeat.
nothing on this board interprets your results for you
Repeat testing before acting is standard practice for a reason: regression to the mean does a lot of work on single outlying values.
Compared two draws across two labs and spent a week worrying before finding out the assays were different.
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.
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.
Same view — ApoB if you add one thing. It answers a question the standard panel only gestures at.
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.
Panicked about a single result, posted here, got told to repeat it, repeated it, and it was fine.
Brought the whole set to my clinician rather than one flagged value. Completely different conversation.
do not change three things and then read the panel
ApoB is the one worth adding if you only add one
ApoB is the one worth adding if you only add one
nnt_nate is right that a reference interval is not a target. It is a description of a population.
What did the repeat show?
same lab, same conditions, or you are comparing noise
Did anything else change in that window — training, intake, hydration?
This. Reference ranges are population intervals, not targets, and conflating them causes a lot of unnecessary alarm here.
Push back: a value just outside a reference interval is a common finding in healthy people. It is a reason to repeat.
Push back: a value just outside a reference interval is a common finding in healthy people.
Disagreeing with this bit: that change is confounded by the weight loss itself and cannot be attributed.
Do you have a baseline from before you started?
Right, and weight loss itself moves several markers, so attribution is harder than these threads assume.
Agreed. The trend is the signal. A single value is a snapshot of one morning.
Agreed.
Adding the obvious one — take it to whoever ordered the panel. This board cannot read it for you.
Disagree with reading anything into that. One value, one morning, and you changed two other things in the same window.
Draw at the same point in the week now, fasting, same lab. The noise dropped enormously once I standardised.
ask whether the lab changed its assay between your two draws
draw at the same point in the week if you want comparability
- 1This. Reference ranges are population intervals, not targets, and conflating…11 comments in this branch · started by u/kaia_kuusela
- 2Repeat testing before acting is standard practice for a reason: regression…6 comments in this branch · started by u/sanne_novak