Whenever people misapply the utility of analytical tests problems arise. Calorimetric assays were initially developed a "field tests" to RULE OUT RATHER THAN CONFIRM THE PRESENCE of a controlled substance.
The difference is HUGE bc folk for some reason hate going to JAIL bc a test was a false positive!
That being said, this form of testing has evolved from one that may determine if a PED was present to one that could reveal if that PED was in fact an AAS
However because the structural characteristics of AAS are strikingly similar, the ability of such testing to reliably determine "concentration" is simply a no go fella!