Surgery In azoospermia, the diagnostic test which can distinguish between testicular failure and obstruction in the vas deferens is: September 2012 A Estimation of FSH level B Estimation of testosterone level C Karyotyping D FNAC of testes 💡 Explanation In azoospermia, the diagnostic test which can distinguish between testicular failure and obstruction in the vas deferens is: September 2012 ✓ Correct Answer: A. Estimation of FSH level