Final answer:
The test to verify sterilization after a vasectomy is a semen analysis or sperm count test, confirming the absence of sperm in the semen.
Step-by-step explanation:
The test used to verify sterilization after a vasectomy is called a semen analysis or sperm count test. This test is conducted several months after the procedure to ensure that no sperm are present in the semen. After a vasectomy, the testes continue to produce sperm, but these are reabsorbed by the body rather than being ejaculated. It is crucial that the patient undergoes a semen analysis post-vasectomy to confirm that no sperm are detected, indicating a successful sterilization procedure. Patients are typically advised to submit one or more semen samples over a period of time to ensure that sperm are completely cleared from the system before considering the vasectomy fully effective and discontinuing other forms of birth control.