is normally measured in nanograms per deciliter (ng/dL.)
Normally functioning adult male testicles produce an average of 7mg of testosterone per day,
1 milligram = 1,000,000 nanograms
1 liter = 10 deciliter
There are 5 liters of blood in the average adult male body.
This means that the average male "total testosterone" output into the bloodstream is:
7,000,000ng / 50 dL = 140,000 ng / dL total testerone per day.
Therefore, using an often accepted 800ng/dL "reference" measurement for "optimal" testosterone, it could be proven that the assay is revealing 1/175th of the total daily testosterone output.
Further, this means that in the theoretical model of the optimal male described above, the total point-in-time reading of 800mg/dL of testosterone is completely metabolized by the body 175 times per day.
800ng/dL in a 5L volume of blood is equivalent to:
800 ng / 1 dL = 40,000 ng / 50 dL = .04 mg / 5L = 0.04mg total testosterone in the bloodstream.
at the time of assay.
0.04mg * 175 cycles = 7mg total testosterone produced by the testicles per day.
Testosterone metabolism appears to be quite rapid! Thoughts? Problems with the math?