A couple comes in for an infertility workup, having attempted to get pregnant for 2 years. The woman, 37, has always had irregular menstrual cycles but is otherwise healthy. The man has fathered two children from a previous marriage and had a vasectomy reversal 2 years ago. The man has had two normal semen analyses, but the sperm seem to be clumped together. What additional test is needed?
Correct Answer: B
Rationale: The correct answer is B: Antisperm antibodies. In this case, the man's history of vasectomy reversal and normal semen analyses with clumped sperm suggest a possible presence of antisperm antibodies. These antibodies can cause sperm agglutination, affecting fertility. Testing for antisperm antibodies can provide valuable information on potential immune-related infertility issues.
A: FSH level is not the most appropriate test in this scenario as the man's semen analyses were normal, indicating potential issues with sperm-egg interaction rather than hormonal imbalances.
C: Testicular biopsy is invasive and not necessary at this stage when the issue seems to be related to sperm clumping rather than a structural problem within the testes.
D: Test of testicular infection is unlikely as the man's semen analyses were normal, and there are no indications of infection based on the information provided.