Teratospermia or teratozoospermia is a condition characterized by the presence of sperm with abnormal morphology that affects fertility in males.
Varicocele is another condition that is often associated with decreased normal forms (morphology).
In cases of globozoospermia (sperm with round heads), the Golgi apparatus is not transformed into the acrosome that is needed for fertilization.
[3] In testing for teratozoospermia, sperm are collected, stained and analyzed under a microscope to detect abnormalities.
[6] Even with severe teratozoospermia, microscopy can still detect the few sperm cells that have a "normal" morphology, allowing for optimal success rate.