We describe here 6 cases of 18-trisomy syndrome and a possible seventh (Fig. 1). Table 1 lists the most frequent anomalies found in these patients. Case 1. M.C. was the 3d child of a Caucasian mother ...

Screening for aneuploid pregnancies is routinely performed after 15 weeks of gestation and has a sensitivity of approximately 65 percent, with a false positive rate of 5 percent. First-trimester ...

A recent study shows that a new DNA test that identifies Down syndrome in pregnancy can also detect trisomies 18 and 13. A newly available DNA-based prenatal blood test that can identify a pregnancy ...