MD here. The vast majority of soldiers are fit and healthy and will have completely normal labs 99% of the time. The times when they are not normal will be insignificant 99% of the time (had a few drinks last night? your GGT level will be slightly above normal briefly). This information is worth next to nothing to anyone.

Do soldiers remain so healthy-by-the-numbers in the field? I'm wondering if many data points would help to identify individuals on the edge of becoming unfit.

Oh .. and another thing.

I do point of care needlestick blood testing on people every day. I check haemoglobin and blood sugar levels. When doing a needlestick test for Hb I always do it twice because these results are often spurious (especially when you "milk" blood out of the finger). The Hb/liter figure can vary by as much as 20-30% routinely. If this is the case I then do a proper venous draw to find the true result. These tests are marginally useful in screening for really low or really high values, but they are pretty much inadequate compared to a proper venous draw for clinical decision making.