Abstract
To determine when in the first and second trimester a raised serum alpha-fetoprotein (AFP) level best predicts low birth weight a case-control study was performed on 157 singleton low birth-weight (less than or equal to 2.5 kg) and 314 singleton control pregnancies (birth weight greater than 2.5 kg). The association between raised maternal serum AFP and low birth weight was confirmed, but there was no special time in pregnancy before 29 weeks gestation when a raised AFP level predicted low birth weight materially better than at any other time.
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