Platelet Counts in Uncomplicated Pregnancies at Term

Area of Science:

• Obstetrics and Gynecology
• Hematology
• Maternal-Fetal Medicine

Background:

• Platelet count is a critical indicator of maternal health during pregnancy.
• Understanding normal platelet count fluctuations is essential for accurate clinical assessment.
• Previous research has not fully detailed weekly changes in platelet counts during late-term uncomplicated pregnancies.

Purpose of the Study:

• To evaluate the trend of platelet counts in uncomplicated pregnancies between 37 and 41 weeks of gestation.
• To establish reference ranges for platelet counts in late-term pregnancies.
• To identify significant changes in platelet counts as gestation progresses.

Main Methods:

• Retrospective analysis of 18,526 women with uncomplicated singleton pregnancies.
• Data collected from August 1, 2011, to May 15, 2018.
• Exclusion of women with pregnancy complications, pre-existing disorders, or medications affecting platelet counts.

Main Results:

• Mean platelet count in uncomplicated pregnancies (37-41 weeks) was 220 × 10^9/L.
• Platelet counts showed a significant weekly decrease from 37 weeks, particularly from 39 weeks onward (p < 0.01).
• At 41 weeks, the mean platelet count was 216 × 10^9/L, with 9.7% of women having counts below 150 × 10^9/L.

Conclusions:

• Platelet counts in uncomplicated pregnancies exhibit a consistent weekly decline from 37 to 41 weeks gestation.
• These findings are crucial for interpreting serial platelet monitoring in pregnant individuals.
• Awareness of this physiological decrease aids in differentiating normal changes from potential pathological conditions.