Thrombocytopenia in the Postpartum Period

Initial Assessment

The American College of Obstetricians and Gynecologists recommends documenting any bleeding symptoms, including bruising, petechiae, and menorrhagia, in patients with postpartum thrombocytopenia 2
A complete blood count with trends over time, focusing on platelet count values, should be reviewed to assess the severity of thrombocytopenia 2
A comprehensive medical history, including previous history of thrombocytopenia, timing of onset, and severity, can help distinguish between gestational thrombocytopenia and immune thrombocytopenia (ITP) 3

A complete blood count with peripheral smear examination is essential to exclude other causes of thrombocytopenia, according to the American Society of Hematology 4
Coagulation studies, including PT, INR, aPTT, and fibrinogen, should be performed to rule out other pregnancy-specific conditions, such as preeclampsia and HELLP syndrome 2
Liver function tests should be conducted to exclude HELLP syndrome, a condition that can cause thrombocytopenia 3, 4

Gestational thrombocytopenia is the most common cause of thrombocytopenia in the postpartum period, accounting for approximately 75% of cases, and is typically mild with platelet counts >70,000 3
Immune thrombocytopenia (ITP) may be associated with neonatal thrombocytopenia, and its diagnosis is based on exclusion of other causes 5

Monitoring of platelet count trends is crucial, with increased frequency as the postpartum period progresses, to assess the risk of postpartum hemorrhage 1
For mild thrombocytopenia (platelet count >50,000) without bleeding symptoms, observation alone may be sufficient, according to the American College of Obstetricians and Gynecologists 4
Treatment is required for women with platelet counts <10,000, and for those with platelet counts of 10,000-30,000 who are bleeding 4

The American Academy of Pediatrics recommends determining cord blood platelet count after delivery by clean venipuncture of a cord vessel to assess the risk of neonatal thrombocytopenia 5
Infants with subnormal platelet counts should be observed clinically and hematologically, as platelet counts tend to nadir between days 2-5 after birth 5
Transcranial ultrasonography should be performed on neonates with platelet counts <50,000/μL to assess the risk of intracranial hemorrhage 2, 5