A member asked:

I had a miscarriage last year, & they gave me a rh shot bc i'm ab-, how long is the shot effective? i'm late on my menstrual. & was diagnosed w/ pcos

A doctor has provided 1 answer

Until next pregnancy: Your rh shot will protect you from developing antibodies against the baby. When you get pregnant again you will probably need another shot. If you think you are pregnant, take a pregnancy test.

Answered 4/22/2014

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