Vasectomy Effectiveness & Failure Rates: Why the Semen Test Matters
Article
Vasectomy becomes dependable after the post-vasectomy semen analysis (PVSA) shows azoospermia (no sperm) or rare non-motile sperm (RNMS) below a set threshold. Until then, use another contraceptive.
Why test?
Sperm can persist for weeks in the system after the procedure; PVSA checks clearance. Australian labs recommend specific collection steps and timing to make results reliable. (RCPA)
How effective is it really?
After PVSA confirms success, the lifetime risk of pregnancy is ~1 in 2,000. Late failure is rare but possible. (nsva.org.au)
When do I test?
Common pathways use a test at about 3 months post-procedure with abstinence and collection instructions from the lab. Follow your personalised plan. (resources.msiaustralia.org.au)
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