The triple test, also called triple screen, the Kettering test or the Bart's test, is an investigation performed during pregnancy . The most common abnormality the test can detect is fetal trisomy 21 . In addition to Down syndrome, the triple and quadruple tests screen for fetal trisomy 18, open neural tube defects, and may also detect an increased risk of Turner syndrome, triploidy, trisomy 16 mosaicism, fetal death, Smith-Lemli-Opitz...