PRENATAL CYTOGENETIC RESULTS FROM CASES REFERRED FOR 44 DIFFERENT TYPES OF ABNORMAL ULTRASOUND FINDINGS

During the period 1987 through mid-1993, 118 490 chromosome analyses f rom amniocytes were performed at the Integrated Genetics Laboratories in Santa Fe, New Mexico (formerly Vivigen Laboratories). This report s ummarizes the data for all specimens submitted because of anomalies se en during ultrasound examination; this includes 44 different categorie s of anomalies. There were 3177 cases referred because of at least one structural abnormality; 494 (15.5 per cent) of the cases had an abnor mal karyotype. Our cytogenetic findings are summarized for the differe nt types of anomalies and the corresponding empirical risks are given for abnormal cytogenetic results.