Genetic abnormalities seen on CVS in early pregnancy failure.

To determine the frequency and distribution of chromosome abnormalities in women with early pregnancy failure (EPF) detected by cytogenetic testing on chorionic villus sampling. Retrospective observational cohort study of chromosomal analysis from transvaginal chorionic villus sampling (CVS) or reflex products of conception (POC) karyotype. CVS was offered as a training tool for Maternal Fetal Medicine fellows prior to manual vacuum aspiration for EPF 9-week gestation. POC were analyzed for cytogenetics if no results were obtained on CVS. One hundred thirty samples were collected from December 2011 to April 2015. 33 (27.3%) cases had a normal karyotype and 88 (73.0%) cases had an abnormal karyotype. The most common group of abnormalities were trisomy, ( = 50, 41.3%), triploidy/tetraploidy, ( = 17, 14.0%), monosomy ( = 15, 12.4%), and structural rearrangements ( = 6, 5.0%). Nine (6.9%) samples were maternal decidua only. Abnormal karyotype in EPF was significantly increased in women by age group ( < .01) but not in women with a history of prior miscarriage ( = .5). Our cohort had a high detection rate of aneuploidy. The most common chromosomal abnormalities in EPF were: trisomy, followed by triploidy/tetraploidy, monosomy, and structural rearrangements. Maternal age had the strongest correlation with EPF associated with aneuploidy.