Which of the following is true about obstructive azoospermia:: (A) FSH and LH increased, (B) Normal FSH and normal LH, (C) LH raised/ Normal FSH, (D) FSH raised, Normal LH
Answer is B. Normal FSH and LH level indicate an obstructive lesion in the vas or epididymis. High FSH indicates gonadal failure. 
Low FSH Indicates pituitary or hypothalamic failure.