A1c: what the trials say vs what this community says
A1c: what the trials say vs what this community says. It is the sort of thing everyone half-believes and nobody writes down. My A1c moved and I spent a fortnight convinced I knew why. The repeat six weeks later was back in range and I had changed nothing. Compared two draws across two labs and spent a week worrying…
Same lab as the previous draw?
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.
Added ApoB to the panel after a thread here. It told me something the standard lipid panel had been hiding.
Same view — ApoB if you add one thing. It answers a question the standard panel only gestures at.
Same view — ApoB if you add one thing.
Adding the obvious one — take it to whoever ordered the panel. This board cannot read it for you.
Same view — ApoB if you add one thing.
santiago_rasmussen is right that a reference interval is not a target. It is a description of a population.
Push back: a value just outside a reference interval is a common finding in healthy people. It is a reason to repeat.
That is a non-fasting value and the interval you are comparing it against is a fasting one.
Small fix — a reference interval is not a treatment target, and the post above uses them interchangeably.
one measurement is a point, two is a line, three is a trend
one measurement is a point, two is a line, three is a trend
This is the sentence to read before anybody panics about a single value.