n.chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell

First-Trimester Screening for Trisomies 21 and 18
Sonographic markers of fetal trisomies: second trimester
First-Trimester Screening for Trisomies 21 and 18 — NEJM
Management of twin pregnancies with fetal trisomies
Detection of fetal trisomies 21 and 18 from maternal blood using triple gradient and magnetic cell sorting
Screening for fetal trisomies by maternal age and fetal nuchal translucency thickness at 10 to 14 weeks of gestation.
Ductus venosus Doppler in screening for trisomies 21, 18 and 13 and Turner syndrome at 11-13 weeks of gestation.
CONFINED PLACENTAL MOSAICISM FOR TRISOMIES 2, 3, 7, 8, 9, 16, AND 22: THEIR INCIDENCE, LIKELY ORIGINS, AND MECHANISMS FOR CELL LINEA...
The genetic architecture of Down syndrome phenotypes revealed by high-resolution analysis of human segmental trisomies
Comment on "Clinical application of massively parallel sequencing-based prenatal non-invasive fetal trisomy test for trisomies 21 an...