Rh D Factor:
Blood is either Rh D positive or Rh D negative, depending on whether or not certain molecules are present. A person who is Rh D negative will experience an immune-system reaction if Rh D positive blood gets into their bloodstream. Therefore your doctor and midwife need to know whether you are Rh D positive or Rh D negative this will be confirmed via a blood test during your first visit.
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