Abstract Thrombocytopenia during pregnancy is often thought to be associated with severe bleeding manifestations. Three are the main disorders associated with this condition: gestational thrombocytopenia (GT), immune thrombocytopenia (ITP), and inherited thrombocytopenias (ITs). Reaching the correct diagnosis of this condition has relevant therapeutic and outcome implications. We performed a retrospective, observational, monocentric study enrolling 59 consecutive women with isolated thrombocytopenia, attended to our referral center in the last 3 years. Together with personal and family history, platelet (PLT) count trend and mean platelet volume (MPV) in pregnancy are helpful for the diagnosis, with the highest PLT count in GT and lowest in ITs, with different timing of count decrease. MPV is significantly increased in both ITs and ITP. Misdiagnosis with ITP was responsible for unnecessary and unsuccessful therapy in some GT or ITs pregnant women, determining relevant side effects. Excluding inherited platelet function disorders (IPFDs), the bleeding risk for mother with thrombocytopenia and their newborns is similar to the general population. Vaginal delivery is associated with a lower risk of bleeding than cesarean section and therefore is preferable whenever obstetrical–gynecological conditions permit.
