Unconjugated estriol and 15alpha-hydroxyestriol in complicated pregnancies.

Simultaneous determinations of unconjugated estriol and 15alpha-hydroxyestriol (E4) levels in maternal serum were studied serially to ascertain the relative usefulness of these estrogens as indicators of fetal welfare. Complicated pregnancies included 16 patients with pre-eclampsia and/or hypertension, six patients with severe Rh-isoimmunization, 12 patients with diabetes mellitus, of which four had vascular disease, three patients with fetal death in utero, and three twin pregnancies. Retrospective analysis failed to indicate a clinically useful role for serum E4 determinations in the evaluation of fetal welfare during high-risk pregnancies.