7 doctors weighed in:
Is the vasectomy effective birth control right away?
7 doctors weighed in

Dr. Craig Keathley
Obstetrics & Gynecology
4 doctors agree
In brief: No
There is a delay until vasectomy can be relied upon.
Your partner will need to have a follow up semen analysis to confirm the absence of sperm.

In brief: No
There is a delay until vasectomy can be relied upon.
Your partner will need to have a follow up semen analysis to confirm the absence of sperm.
Dr. Craig Keathley
Dr. Craig Keathley
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Dr. James Lin
Urology
In brief: Up to 99.85%...
Vasectomy will not provide an instant contraception so post-vasectomy precaution against pregnancy has to continue until post-vasectomy semen exam shows no sperm.
Besides, recanalization may occure. Note: its effectiveness for birth control is up to 99.85 % although post-vasectomy re-canalization rate up to 1-5%.

In brief: Up to 99.85%...
Vasectomy will not provide an instant contraception so post-vasectomy precaution against pregnancy has to continue until post-vasectomy semen exam shows no sperm.
Besides, recanalization may occure. Note: its effectiveness for birth control is up to 99.85 % although post-vasectomy re-canalization rate up to 1-5%.
Dr. James Lin
Dr. James Lin
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Dr. Robert Kwok
Pediatrics
In brief: Not for some weeks
Vasectomy prevents sperm from going into semen, and should include: the surgery, using other birth control or condoms to collect the next 20 ejaculations (for 6 weeks), and then giving a semen sample at the urologist's office to be sure no more sperm is in the semen.
After all three of these things are done, a vasectomy is effective (extremely low failure rate of approx.1 in several thousand men).

In brief: Not for some weeks
Vasectomy prevents sperm from going into semen, and should include: the surgery, using other birth control or condoms to collect the next 20 ejaculations (for 6 weeks), and then giving a semen sample at the urologist's office to be sure no more sperm is in the semen.
After all three of these things are done, a vasectomy is effective (extremely low failure rate of approx.1 in several thousand men).
Dr. Robert Kwok
Dr. Robert Kwok
Thank
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