It is a blood test of the
pregnant woman at 12 wks and later at 15-18 wks. Ultrasound is also required. It is a screening test for chromosomal abnormalities like Down’s syndrome. It is mandatory for high risk mothers.
Next Steps
If it indicates high risk, further confirmatory tests are required like amniocentecis
Health Tips
To get the correct interpretation, the test should be done at the said gestation only