Postvasectomy Semen Analysis

Vasectomy does not make a man infertile at once, because sperm remain in the tract beyond the point of occlusion. Semen analysis after the procedure shows whether sperm have cleared, and clearance is the point at which backup contraception can stop. Protection is considered effective 3 months after the procedure, and a backup method is needed until then.

Why sperm persist. Sperm stored in the ampulla, seminal vesicle and distal vas are cleared by ejaculation over weeks to months.

Effectiveness after clearance. First-year pregnancies are 0.15 per 100 women with typical use and 0.1 per 100 women with perfect use. Late failure from recanalisation after clearance is rare, about 1 in 2,000 men.

Early failure. Persistent motile sperm after 3 months indicates incomplete occlusion or recanalisation.

Return to fertility. The procedure is virtually irreversible.

Who needs analysis. Every man after vasectomy where a laboratory is available. Where no laboratory is available, the couple keeps backup for 3 months and is told that clearance has not been verified.

Sample. Produce by masturbation into a clean wide-mouthed container, deliver within 1 hour at body temperature, and examine fresh. A man who cannot produce a sample or lost part of it should repeat the test.

Examination. Wet preparation of well-mixed semen for sperm, then centrifugation and examination of the pellet if none are seen. Report the presence or absence of sperm, whether they are motile, and an approximate number.

Interpretation.

Partner assessment. A woman with a missed period needs a pregnancy test irrespective of clearance.

Counselling content. Explain that backup continues until clearance is stated, that a sample must be fresh and complete, and that late failure is rare but possible.

Clearance regimen line. Test: semen analysis. Start: 3 months after the procedure. Method of backup: condoms or the partner’s contraception. Backup duration: 3 months at least, and until clearance is documented where analysis is available. Missed-use rule: not applicable. Switching overlap: a woman with an intrauterine device keeps it for 3 months after her partner’s vasectomy.

Sequence.

1. At the procedure, give a written date for the sample at 3 months and condoms for the interval.
2. At 3 months, collect the sample and examine it fresh.
3. Document the result, the date and the counselling given.
4. If sperm are absent, record clearance and stop backup.
5. If sperm are present, continue backup and repeat after about 4 weeks.
6. If motile sperm persist at 6 months, plan a repeat vasectomy or refer.

Where no laboratory is available. Continue condoms for 3 months, document the advice, and tell the couple that clearance has not been verified and that unplanned pregnancy should prompt re-evaluation.

Records. Retain the result in the patient’s file with date of procedure, technique, date of analysis and the clearance decision.

Follow up after clearance. No routine repeat tests. Return if the partner conceives, or for pain or regret.

Pregnancy after clearance. Confirm the pregnancy, repeat semen analysis at once, and consider other sources of paternity if analysis shows no sperm. Offer the couple a repeat vasectomy if recanalisation is confirmed.

Persistent sperm. Continue backup. A repeat procedure is needed for persistent motile sperm at 6 months.

Post-vasectomy pain. Ibuprofen 400 mg orally every 8 hours with food for 3 to 5 days, maximum 1.2 g daily, avoided with peptic ulcer, anticoagulation or creatinine clearance under 30 mL/min, with scrotal support and warm soaks. Paracetamol 1 g every 6 hours, maximum 4 g daily (3 g in liver disease).

Infection. Cefalexin 500 mg orally every 6 hours for 5 to 7 days, maximum 4 g daily, reduced to 250 mg every 8 to 12 hours at creatinine clearance 15 to 29 mL/min and 250 mg every 24 hours under 15 mL/min. In severe penicillin allergy, clindamycin 300 mg every 6 hours for 5 to 7 days, maximum 1.8 g daily.

Regret. Counsel and refer for reversal assessment.

Referral and escalation. Refer failed occlusion needing repeat surgery, persistent pain, and cases where sperm cannot be reliably assessed.