How can we differentiate between the various kinds of azoospermia?

In this video, Dr. Kaberi Banerjee, Medical Director, Advanced Fertility & Gynecology Center, New Delhi, will discuss how to differentiate between the various kinds of azoospermia. Azoospermia is of two kinds: one is obstructive and the second is non-obstructive. In obstructive azoospermia sperms are generated in the testes but because of blockage of tubes are not released. In non-obstructive azoospermia, the sperms are not generated in the testes. The difference is detected by doing a FSH levels and testicular volume.