RT Book, Section A1 Wilnai, Yael A1 Manning, Melanie A2 Stevenson, David K. A2 Cohen, Ronald S. A2 Sunshine, Philip SR Print(0) ID 1109799398 T1 Common Chromosomal Trisomies 21, 18, and 13 T2 Neonatology: Clinical Practice and Procedures YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 9780071763769 LK accesspediatrics.mhmedical.com/content.aspx?aid=1109799398 RD 2024/04/16 AB Chromosome abnormalities account for a significant portion of genetic disease and are important causes of congenital malformations and pregnancy loss. Cytogenetic disorders are found in nearly 1% of live births; thus, performing a karyotype on a newborn with multiple congenital anomalies can provide valuable information with respect to management questions and prognosis counseling. Chromosome analysis is indicated as a diagnostic procedure in a number of different general clinical situations, such as problems with early growth, development, stillbirth, and neonatal death. For infants in the neonatal period, performing a chromosome analysis may be considered if any of the following features are demonstrated: