Antenatal screening for chromosomal abnormalities.

摘要

A method for antenatal screening for chromosomal abnormalities in a foetus in which the gestational age of a pregnant woman is determined characterised in that the gestational age is determined (a) by reference to the last menstrual period dates and (b) by a biometric measurement of the foetus, the difference between the ages as determined in (a) and (b) is calculated and the calculated difference is examined using reference data to determine fetal abnormalities.