Early answers, highest detection, and lowest false positive rates
- Part I: 11-13 6/7 weeks
(NT and maternal blood)
- Part II: 15-18 weeks
(2nd maternal blood sample)
- 91% Down syndrome detection
- 90% trisomy 18 detection
- 80% detection of neural tube defects
- 3.7% false positive rate
Results given following both part I and part II.
Patients can have diagnostic testing (i.e. CVS or amniocentesis) without completing part II if the results of part I are concerning.