Platelet count at term pregnancy: A reappraisal of the threshold

Objective: To assess the safety of a new platelet count threshold for the definition of maternal thrombocytopenia late in pregnancy. Methods: A platelet count was performed in 6770 pregnant women late in pregnancy and in 6103 of their newborns as well as in a control group of 287 age-matched nonpregnant healthy women. Results: The prevalence of maternal thrombocytopenia (platelet count less than 150 x 10(9)/L) was 11.6%. The mean platelet counts (248 compared with 213 x 10(9)/L) and 2.5th percentile (164 compared with 116 x 10(9)/L) were significantly higher in healthy nonpregnant women than in pregnant women. Among thrombocytopenic pregnant women, 621 (79%) had platelet counts between 116 and 149 x 10(9)/L; none (0%; 95% confidence interval 0, 0.6) had complications related to thrombocytopenia, and none of their newborns had severe thrombocytopenia (platelet count less than 20 x 10(9)/L). Conclusion: In healthy pregnant women, a platelet count over 115 x 10(9)/L. late in pregnancy does not require further investigation during pregnancy and may be considered a safe threshold. (Obstet Gynecol 2000;95:29-33. (C) 2000 by The American College of Obstetricians and Gynecologists.).