Number of sperm
counted X dilution (20)
= sperm per cu mm
Sperm per cu mm X 1000 = sperm per ml.
h. Sources of Error.
Delay in analysis results in a lower percentage of motile forms and a
Temperature extremes cause spermatozoa to die.
See paragraph 5-2e for sources of error when counting.
(1) Semen analyses are usually performed as part of infertility studies or
following a vasectomy.
(2) Semen analysis can be performed for medico-legal cases involving rape
or to support or disprove a denial of paternity on the grounds of sterility.
(3) Semen is derived from the following: testes, seminal vesicles, prostate,
epididymides, vasa deferentia, bulourethral glands, and urethral glands.
j. Normal Values.
Volume: 1.5-5.0 ml.
Motility: 60-90 percent.
Spermatozoa Count: 60-150 million per ml.