Hi, one possibility is that the lab could have made a mistake or there was a
mix-up with specimens?  MM

There is no possibility 2 RH- parents can have an RH+ baby. The positive
gene is dominant, therefore:

If a person has the genes + +, the Rh factor in the blood will be positive. 
If a person has the genes + -, the Rh factor will be positive. 
If a person has the genes - -, the Rh factor will be negative.

Therefore both those parents had the - - genes and could not have passed on
the + gene and therefore can't have produced a positive baby!

Kirsten

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