I have a patient who is 37 years and presented due to infertility, His semen analysis azoospermia, and peroxidase test: Spermatogenic cells = 100,000, WBCs = 100,000 free Testosterone LH, FSH, Prolactine, All within normal range TSH: 6.3 normal toatal T4, T3 What is the next step in his management?