Exogenous testosterone suppresses endogenous lutenizing hormone (LH) and folicle stimulating hormone (FSH) levels. LH stimulates the testicle to produce testosterone, while FSH stimulates sperm production. Although a decrease in sperm production occurs, this does not necessarily result in infertility. Semen analysis is the major test for evaluating male infertility. This test provides important information about the quality and quantity of the sperm. The semen sample is analyzed for volume, viscosity (thickness), pH and color of the ejaculate, sperm concentration, motility, morphology, and forward progression of the sperm. The sample is also examined for the presence of white or red blood cells which may indicate infection or inflammation.
Jenetic