Management of Postpartum Hematologic Complications

Diagnostic Considerations

The American College of Obstetricians and Gynecologists recommends immediate evaluation for microangiopathic hemolytic anemia, specifically atypical hemolytic uremic syndrome (aHUS), in patients with persistent anemia and thrombocytopenia after delivery 1
A peripheral blood smear should be obtained immediately to identify schistocytes, which indicate microangiopathic hemolysis, a hallmark of thrombotic microangiopathy (TMA) 1
The American Society of Hematology suggests that a direct Coombs test must be performed to exclude autoimmune hemolysis 1
Haptoglobin levels will be low if hemolysis is occurring, and combined with elevated LDH, this suggests recent hemolytic activity 1
ADAMTS13 activity level should be measured urgently if TMA is suspected, as levels <10% indicate thrombotic thrombocytopenic purpura (TTP) requiring plasma exchange 1
Fibrinogen level is critical, with normal postpartum levels being 4-6 g/L, and <2 g/L suggesting consumptive coagulopathy 2, 1

Pelvic ultrasound with color Doppler must be performed to exclude retained products of conception, hematoma formation, or ongoing bleeding, particularly important given the cesarean scar weakness 1, 3
Transvaginal ultrasound is superior for identifying vascular retained tissue at the cesarean scar site 1, 3
Serial CBC should be performed every 6-12 hours until stable 2, 3
Daily LDH, haptoglobin, and bilirubin should be monitored if hemolysis is suspected 1

The American College of Obstetricians and Gynecologists recommends transfusing packed red blood cells immediately if hemoglobin is below 7.0 g/dL, regardless of symptoms 1
Each unit of packed red blood cells should increase hemoglobin by approximately 1 g/dL 1
Target hemoglobin should be >7.0 g/dL for hemodynamic stability 1
Platelet transfusion is contraindicated if TTP is suspected (ADAMTS13 <10%) as it may worsen thrombosis 4
If aHUS is suspected, platelets may be given if severe bleeding occurs, but complement blockade is the definitive treatment 1
Intravenous iron should be initiated after acute bleeding is controlled and hemolysis excluded, with a total dose of 800-1500 mg 1

The American College of Chest Physicians recommends initiating prophylactic low-molecular-weight heparin (LMWH) once hemostasis is secured and platelet count >50,000/μL, given post-cesarean status and day 5 postpartum 5, 6, 7
LMWH should be continued until hospital discharge at minimum, and consideration should be given to extended prophylaxis up to 6 weeks postpartum given multiple risk factors 5, 6