Test Details: The presence of maternally derived cells associated with prenatal sampling procedures such as chorionic villus (CVS) or amniotic fluid (AF) poses a risk for prenatal misdiagnosis. Maternal cell contamination studies (MCC) are performed in the prenatal testing arena to ensure the fetally derived sample is not compromised by maternal cells. In addition to prenatal diagnosis of inherited molecular, cytogenetic, or metabolic disorders, maternal cell contamination (MCC) analysis may also be used in conjunction with zygosity analysis to rule out the presence of contaminating maternal or co-fetal material in multiple gestation pregnancies.