We have investigated whether the levels of thrombin-activatable fibrinolysis inhibitor (TAFI) were correlated with D-dimer levels during pregnancy and at delivery. From the 10th week of pregnancy to delivery, 519 samples from 144 women (mean age 29.3 +/- 5, range 19-43) were obtained. We confirm the gradual increase of D-dimer levels, and provide reference intervals for D-dimer measurements throughout normal pregnancy. TAFI levels increased moderately during pregnancy but no inverse correlation with D-dimer levels was observed.