“…The recent prospective study of Uriel and colleagues 19,23 used flow cytometry to determine the volume of FMH during delivery; however, they describe only a small set of patients (n = 346) who were further divided into three groups: vaginal delivery (n = 196), vacuum extraction or forceps delivery (n = 59), and delivery by cesarean section (n = 55). The volume of FMH during delivery ranged from not more than 0.1 to 25.2 mL (mean, 0.25 mL; SD, 1.58 mL), vaginal delivery (mean, 0.12 mL; SD, 0.51 mL; median, 0.03 mL), delivery by cesarean section (mean, 0.67 mL; SD, 3.44 mL; median, 0.03 mL), the difference was statistically significant (p 0.001).…”