How can we differentiate between the various kinds of azoospermia?

MBBS, MD - Obstetrics & Gynaecology, DNB - Obstetrics & Gynecology, MRCOG, Infertility Specialist. A seasoned Obstetrician & Gynaecologist with more than a decade of experience in IVF infertility management. An infertility and IVF specialist, trained from the prestigious Guys and St Thomas Hospital, London where she went as a commonwealth scholar. Currently working as a clinical director of Advance Fertility & Gynocological Center, New Delhi. Has done more than 3000 IVF cycles so far and specializes in repeat IVF failures, donor and surrogacy. Completed her MBBS and MD in Obstetrics & Gynaecology from the prestigious All India Institute of Medical Sciences (AIIMS), New Delhi. Done her membership from the Royal College of Obstetrics and Gynaecology (MRCOG), London. Member of the National Academy of Medical Sciences (MNAMS). Writes articles & columns for international journals, scientific publications, presentations and IVF website. Has received many renowned national awards, including IMA award in IVF in 2007 and Bharat Jyoti Award in 2008, for outstanding contribution in medicine. Organizing chairperson of CUPART (Current Practices and Recent Advances in ART).