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Maternal serum free beta-human chorionic gonadotrophin levels in twin pregnancies: implications for screening for
1Department of Environmental and Preventive Medicine, Wolfson Institute of Preventive Medicine, St Bartholomew's Hospital Medical College, London, U.K.
Prenatal Diagnosis
|April 1, 1994
Abstract:
Free beta-human chorionic gonadotrophin values are, on average, 1.90 times greater in twin pregnancies than in singleton pregnancies [95 per cent confidence interval (CI) 1.69-2.13]. This information can be used in screening for Down's syndrome, so that twin pregnancies can be interpreted in addition to singleton pregnancies.