Angiogenic factors and uterine Doppler velocimetry in early- and late-onset preeclampsia.

Objective: To assess correlations between maternal serum levels of pro- and anti-angiogenic factors with uterine perfusion in women with early- compared with late-onset preeclampsia, and in healthy pregnant women.

Design: Case-control study.

Setting: Antenatal care clinic located within a hospital (São Bernardo do Campo, Brazil).