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Is a study combining hormonal and ultrasound analysis that takes maternal age into account. It is performed between week 9 and 13 of pregnancy.
Is performed at dierent times throughout the pregnancy and can lead to the suspicion of Down, Edwards, or Patau syndromes. A diagnostic test is required to confirm any suspicion that may arise.
Is performed from week 15 from an amniotic liquid sample. It is an invasive test with a risk of spontaneous abortion of 0.5-1%.
Similar to amniocentesis, it is an invasive test with a risk of spontaneous abortion of 1-2%. It is performed from week 11.