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The possibility of using first trimester maternal serum human chorionic gonadotrophin (HCG) profiles to predict fetal growth retardation (FGR) was tested in 236 women with singleton pregnancies obtained after in-vitro fertilization (IVF). Pregnancies were monitored by serial analysis (two or more) of serum HCG at at least 48 h intervals. Serum was obtained between the 13th and the 35th day after conception (i.e. on the day of IVF). Early miscarriage occurred in 23.7% and FGR in 10.9% of pregnancies. Serum HCG profiles were higher than the 90th and lower than the 10th percentile in 12.3% and 19.5% of the cases respectively. FGR was significantly more frequent in women with serum HCG profiles lower than the 10th percentile than in women with normal profiles (45.5% versus 7.2%; P &lt; 0.001), with a relative risk of 6.5 (95% confidence interval 2.7-15.6). FGR rates were similar in women with normal and high profiles of serum HCG. Pre-eclampsia and premature delivery rates were similar in women with normal and abnormal profiles of serum HCG. First trimester serum HCG should be further investigated as a potential marker of FGR.

Predictive value of early human chorionic gonadotrophin serum profiles for fetal growth retardation