Quadruple testing
The quadruple test is a way for doctors to screen for babies with Down's syndrome. It is more sensitive test than a double test or triple test. The quadruple test measures the levels of four markers for Down's syndrome in the mother's blood, instead of just three or two.
Low levels of two proteins (alpha-fetoprotein and unconjugated oestriol) and high levels of two hormones (human chorionic gonadotropin and inhibin) indicate that the baby is likely to have Down's syndrome.
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