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If both parents are RH negative, I would assume the baby would also be RH negative. Why then would the mother have been given a Rogam injection at the time of a miscarriage in the first trimester? 


If the mother had positive antibodies in her system, would this be an indication the the negative husband was not the father of the baby?


It is normal for Rh Negative mothers to receive a rogam injection after a miscarriage or D&C. This is a simply a precautionary measure "just in case"....

Most Doctors will not tell the patient that "just in case" means "just in case your partner is not the actual father", but this is the main reason why the rogam is given to every Rh negative mother in these cases. 

After birth, the blood type of the baby is checked and if it is RH positive, the Rh -ve mother will get a rogam shot. If negative, the "just in case" factor is not an issue.


See Also:

Blood Types

Rh Disease


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