The full male hormone panel sounds good, of course (for one thing, you want to make sure your estradiol hasn't been creeping up with the testosterone). Also, how about a Comprehensive Metabolic Panel with a Complete Blood Count and Differential (something like a CMP14+LP+5AC+CBC/D/Plt)? This will give you something like maybe 30 or 40 different blood factors, including fasting glucose, basic cholesterol panel, liver enzymes, hemoglobin, white blood count, platelets, etc. This sounds like a lot, but it's just a simple blood draw, and generally cheaper than the hormones. Doc may have been assuming this one, and just checked the testosterone box as an addition to it. (A TSH -- thyroid - might not be bad to throw in with the other hormones, as well -- it's fairly cheap, too.) Just thinking out loud.