1. Validity of radioimmunological methods for determining free testosterone in serum 
Annette Gruschke, M.D., Herbert Kuhl, Ph.D. 
Fertility and Sterility 
Volume 76, Issue 3, Pages (September 2001)
DOI: /S (01)

2. Figure 1
Comparison of the serum concentrations of free T in various groups of women as determined by means of an ultrafiltration technique and two commercially available radioimmunoassays (RIA DPC and RIA DSL). Hatched columns represent ultrafiltration; solid columns represent RIA DPC; and open columns represent RIA DSL. OC = women using oral contraceptives, MP = menopausal women, NW = normal healthy women, AC = patients with acne and normal total T, HI = hirsute women with normal total T, PR = pregnant women, HA = patients with hyperandrogenemia, AGS = patients with adrenogenital syndrome.
Gruschke. Validity of free testosterone determination. Fertil Steril 2001.
Fertility and Sterility  , DOI: ( /S (01) )