Talk to Dermatologist on Azoospermia

AOA my prob is that my husband is azoospermic (non obstructive type). His hormones are have done biospy (TESA) but no sperm were has also completed 6 months course of Femara but still no improvemnt in count. Dr has advised us to go for Microtese procedure but before that he asked us to do y chromosome microdeletion test to make sure that there is no genetic was an online session and unfortunately we have lost that any dr guide us which test is done for diagnosis of y chromosome microdeletion