<prompt> A couple complains of primary infertility in spite of staying together for 4 years and having unprotected intercourse, all tests in a wife are normal. Semen analysis shows a volume of 0.8 ml sperm count is 0, fructose is absent what is done next?Testicular FNACUltrasound for obstructionLocal palpation of vasKaryotyping  <response>: This is probably a case of obstructive azoospermia.In this condition we need to know the site and nature of blockage. Among the given options ultrasound is the best. Vasogram can also be done. 