PharmacoVig_BOS said:

It is worth asking what the claim would look like if it were false.

Mine went the same way, slower.

Following on from Dr.ObesityLA — and this may be the naive question:

How to read eGFR during rapid weight loss, given that creatinine depends on muscle mass and muscle mass is changing?

BethLabQueen said:

If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.

I am going to disagree with the direction of travel here. The thread has converged on the tidiest answer rather than the best-supported one, and those are not the same thing.

Worth separating that from renal function, which this thread keeps folding into the same question. They behave differently and the advice does not transfer.

BethLabQueen said:

If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.

Fair, and it stops being fair at the extremes. The middle of the range is well understood; the ends are where the honest answer is that nobody knows.

Moderator note: good thread. Keeping it here rather than moving it, because the question is general enough to be useful.