RT Journal
A1 Finucane TE
T1 MEn, androgen deficiency, and pharmaceutical promotion
JF Archives of Internal Medicine
JO Archives of Internal Medicine
YR 2009
FD January 12
VO 169
IS 1
SP 87
OP 89
DO 10.1001/archinternmed.2008.555
UL http://dx.doi.org/10.1001/archinternmed.2008.555
AB 
The choice of this level is a bit arbitrary (low reference value for total testosterone ranged from 130 to 450 ng/dL in one study),2 is presumably based on a mean (SD) value, and is not discussed in the article. In the authors' words, the symptoms are “less specific”: low libido and 2 or more of sleep disturbance, depressed mood, lethargy, or diminished physical performance would qualify.