When it should be done
... so carried out between 18-22 weeks to determine the risk of the fetus developing rhesus disease. It may be necessary to carry ou ... » Read on How it is performed
... a small sample of amniotic fluid (the fluid that surrounds the fetus in the womb) is taken for testing in a laboratory. The flu ... » Read on
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Introduction
... , based on the age at which it develops and the severity of the symptoms. Types I, II and III develop in childhood. Type IV is S ... » Read on
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