Invasive prenatal testing – amniocentesis, chorionic villus sampling (CVS)
Main indications - reasons:
- positive screening for congenital anomalies (mother’s blood testing eventually followed by ultrasound scanning selects women with an increased risk of chromosomal anomalies in a fetus, e.g. Down syndrome)
- need for additional testing for patients with hereditary diseases in the family (e.g. molecular genetics)
- previous pregnancy terminated due to a detection of a congenital anomaly (invasive testing done by patient’s request)
- patient is 35 or more at time of birth (invasive testing done by patient’s request)
- amniotic fluid testing – amniocentesis