Triple test Triple test The triple test, also called triple screen, the Kettering test or the Bart's test, is an investigation performed during pregnancy in the second trimester to classify a patient as either high-risk or low-risk for chromosomal abnormalities (and neural tube defects). The term "multiple-marker screening test" is sometimes used instead. This term can encompass the "double test" and "quadruple test" (described below). The Triple screen measures serum levels of AFP, estriol, and beta-hCG, with a 70% sensitivity and 5% false-positive rate. It is complemented in some regions of the United States, as the "Quad screen" (adding inhibin A to
Owned-and-operated television stations in the United States 1954 to 1960). The network wanted to see if a UHF station could effectively compete against VHF stations, and attempted to make the stations more competitive by investing in significant equipment upgrades. However, WBUF consistently ranked behind its VHF competitors, WGR-TV (channel 2, now WGRZ) and WBEN-TV (channel 4, now WIVB-TV). Similarly, WNBC consistently rated behind VHF competitor WNHC-TV (channel 8, now WTNH); WNBC faced an additional problem as its signal was not strong enough to cover New Haven and western Connecticut (nearly all of Connecticut is part of the Hartford-New Haven market). By the time the FCC allocated additional