Changes in platelet function, volume and count during labor and 24 hours postpartum

Increased platelet activation has been reported during labor. We evaluated changes in platelet count, volume and function during labor and 24 hours postpartum. Platelet function during labor was not previously evaluated. Twenty-five healthy women in labor, subsequently having singleton spontaneous vaginal delivery following uncomplicated pregnancy at term were recruited for this prospective study. Blood was withdrawn during latent phase, active phase, second stage of labor, and 24 hours postpartum. Platelet function was assessed by hemoSTATUS2 test (Hepcon®, Medtronic, USA). Twenty-five healthy non-pregnant volunteers served as controls. Platelet count and volume did not change significantly throughout labor and 24 hours postpartum. Platelet function was 120.8 ± 26.9%, 106.8 ± 24.6% (p = 0.06), 105.2 ± 30.9% (p < 0.05), and 117.6 ± 21.5% during latent phase, active phase, second stage of labor, and 24 hours postpartum, respectively. Platelet function was altered during labor while platelet count and volume did not change significantly. Platelet function remained increased when compared to non-pregnant controls.