Application of intelligent algorithms in Down syndrome screening during second trimester pregnancy

Table 1 Some major fields in the prenatal down syndrome screening and postnatal follow-up database

S/N	Date of receipt	Pregnant mother number	Sample number
Date of birth	Blood sampling date	Expected age at delivery	T21 age riskvalue
T18 age risk	AFP MoM1	hCGb MoM	uE3 MoM
AFP concentration2	hCGb concentration	uE3 concentration	Gestational age
Body weight	Examination unit	Date of last menstruation	Ethnicity/race
Menstrual cycle	History of abnormal pregnancy	Smoking status	CRL3
BPD4	NT5	Fetal chromosomal karyotype	Pregnancy outcomes

¹Multiple of the median.

²Median concentration.

³Crown-rump length.

⁴Biparietal diameter.

⁵Nuchal translucency. AFP: Alpha-fetoprotein; uE3: Unconjugated estriol; hCGb: Human chorionic gonadotropin.