that's easy - you ask me
what i have done, and what anyone can do, is go through the literature for various nutrients and read what is the usual average value in "healthy controls".
for instance, in the case of ms and uric acid, ms-ers average 194 µmol/L.
ms patients headed for relapse have numbers down towards the 160s.
ms patients in remission average more in the 230 ballpark.
people whose levels get up over 360 are asking for gout.
healthy controls have uric acid levels around 290-300.
but, the 'normal range' for uric acid is 140-360!?!
some doctors just want to tell you "everything's normal" and leave it at that.
if doctors were assessing IQ with lab work, they'd be telling forrest gump and einstein that they were normal. it's just a bell curve, not normal-healthy.
when you're sick, you need to get the numbers and units and decide for yourself if you're "optimal".
i have a bunch of other targets nailed down too, or nearly so, so ask away if you're interested