Maternal serum alpha-fetoprotein levels in ectopic pregnancy.

Maternal serum alpha-fetoprotein (AFP) was measured at the time of presentation in 44 women with histologically proven ectopic pregnancy. Serum AFP levels were within the reference range in 32 women. Eleven women (25%) had AFP levels above the 90th centile of the normal range, including five women with a live fetus seen ultrasonically preoperatively. The two women with a ovarian pregnancy and a cornual pregnancy had levels below the median value for gestational age.