semen analysis (abnormal sperm density)
A sperm count below 15x 10^6/ml (oligozoospermia) (1) should be considered clinically relevant, a count below 5x 10^6/ml (severe oligozoospermia) should be considered to have significant clinical relevance.
Reduced sperm count is generally idiopathic. However it may be due to defective spermatogenesis or an incomplete obstruction.
Last reviewed 01/2018