Template:Prenatal Diagnosis terms

Prenatal Diagnosis Terms

false negative rate - The proportion of pregnancies that will test negative given that the congenital anomaly is present.

false positive rate - The proportion of pregnancies that will test positive given that the congenital anomaly is absent.

negative predictive value - The probability that a congenital anomaly is absent given that the prenatal screening test is negative.

positive predictive value - The probability that a congenital anomaly is present given that the prenatal screening test is positive.

pre-implantation genetic diagnosis - (PGD) a screening procedure for embryos produced through in vitro fertilisation (IVF) for genetic diseases that would generate developmental abnormalities or serious postnatal diseases.

prenatal screening sensitivity - (detection rate) The probability of testing positive on a prenatal screening test if the congenital anomaly is present.

prenatal screening specificity - The probability of testing negative on a prenatal screening test if the congenital anomaly is absent.

Terms

Femur length - (FL) is used to determine fetal age and normal development (small/large/abnormal) parameters. The femur is the longest bone in the body and measurements and reflects the longitudinal growth of the fetus (approximately 14 weeks 1.5 cm - term 7.8 cm). It is one of the four typical ultrasound assessments of fetal size and age: Biparietal Diameter (BPD), Head Circumference (HC), Abdominal Circumference (AC), and Femur Length (FL).