Histopathology of various spermatogenesis disorders. The diagnosis of oligozoospermia is based on one low count in a semen analysis performed on two occasions. For many decades sperm concentrations of less than 20 million sperm/ml were considered low or<unk> , recently, however, the WHO reassessed sperm criteria and established a lower reference point, less than 15 million sperm/ml, consistent with the 5th percentile for fertile men. Sperm concentrations fluctuate and<unk>  may be temporary or permanent. Sources usually classify<unk>  in 3 classes: *Mild: concentrations 10 million – 15 million sperm/mL *Moderate: concentrations 5 million – 10 million sperm/mL *Severe: concentrations less than 5 million sperm/mL The diagnosis of oligozoospermia requires a work-up via semen analysis (listed in Male infertility).
Oligospermia
Hypospermia
Azoospermia
Hematospermia
Teratospermia
Asthenozoospermia
Globozoospermia
Dyschronometria