First Trimester Screen With Nuchal Translucency

For test inquiries, call CMBP genetic services at 800-345-4363. Client must provide a fetal nuchal translucency (NT) measurement and crown rump length measurement. The NT measurement must be performed by a sonographer credentialed by the Fetal Medicine Foundation or other equivalent entity. The sonographer's credential/certification number must be provided. The following information must also be provided: patient's weight, patient's date of birth, and the number of fetuses. Also indicate relevant patient history (i.e. prior Down syndrome pregnancy, ultrasound anomalies). Complete information is necessary to interpret the test. Patient information may be provided to the laboratory using the Maternal Prenatal Screening request form (0900). Serum testing is provided from 10.0 to 14.0 weeks' gestation. NT can be assessed when the CRL is 45 to 84 mm.