Umbilical cord puncture

1. During an umbilical cord puncture the gynaecologist punctures a blood vessel in the umbilical cord to remove foetal blood. That is treated in the same way as other prenatal samples.
    
2. The lab then carries out a chromosome examination.
    
3. In exceptional cases a DNA analysis can also be carried out on umbilical blood, but that is not technically possible for every condition.

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