Perinatology.com

Hematologic Disorders in Pregnancy

Updated clinical reference page for anemia, transfusion issues, platelet disorders, thrombophilia and venous thromboembolism, antiphospholipid syndrome, sickle cell disease, thalassemia, hemophilia carriers, and von Willebrand disease.

Overview

Hematologic disease in pregnancy ranges from common problems such as iron deficiency anemia and gestational thrombocytopenia to higher-risk disorders such as sickle cell disease, inherited bleeding disorders, antiphospholipid syndrome, thrombophilia, and pregnancy-associated venous thromboembolism.

This updated page keeps the classic Perinatology topic structure but replaces outdated links with current guidance from ACOG, ASH, SMFM, and related specialty resources.

Quick navigation

Anemia General / Transfusion Sickle Cell / Thalassemia Hemophilia / vWD Platelet Disorders Antiphospholipid Syndrome Coagulation Disorders & VTE General Resources

Anemia

Iron deficiency remains the most common cause of anemia in pregnancy, but evaluation should also consider hemoglobinopathies, macrocytic anemia, hemolysis, and less common marrow or systemic disorders.

Clinical points

  • Screening and management should distinguish physiologic dilutional change from clinically important anemia.
  • Iron deficiency anemia should be treated; current guidance supports oral iron first-line and IV iron when indicated.
  • Severe or atypical anemia warrants broader workup including indices, ferritin, smear, and hemoglobinopathy assessment when appropriate.
  • Symptoms, gestational age, and obstetric bleeding risk affect urgency of correction.

Updated references

General / Transfusion

Hematology consultation is often useful when pregnancy is complicated by significant anemia, thrombocytopenia, bleeding disorders, hemoglobinopathies, or anticoagulation decisions.

Clinical points

  • Transfusion decisions in pregnancy should be individualized and driven by symptoms, bleeding, hemodynamics, and the specific disorder.
  • Do not assume all hematologic abnormalities are pregnancy-related; some reflect preexisting disease or obstetric emergencies.
  • Delivery planning should anticipate hemorrhage, anticoagulation interruption, and neonatal implications where relevant.

Reference links

Sickle Cell Disease / Thalassemia

Hemoglobinopathies are a major modern focus because current pregnancy care emphasizes universal hemoglobinopathy testing and structured high-risk management when disease is present.

Sickle cell disease

  • Pregnancy with sickle cell disease carries higher risk of maternal and perinatal morbidity and merits multidisciplinary care.
  • Vaccination review, folic acid supplementation, infection prevention, pain management planning, and serial fetal growth surveillance are important.
  • Iron should not be given routinely unless deficiency is confirmed.

Thalassemia

  • Pregnancy planning should address transfusion status, iron overload, cardiac function, endocrine complications, and partner screening.
  • Management is best individualized with hematology input, especially in transfusion-dependent patients.
Updated references

Hemophilia Carriers / von Willebrand Disease

Inherited bleeding disorders in pregnancy require anticipatory planning for delivery, neuraxial decisions, postpartum hemorrhage prevention, and neonatal management.

Clinical points

  • Pregnant patients with known bleeding disorders or carrier status should have third-trimester factor assessment and delivery planning.
  • Potentially affected fetuses and newborns require careful intrapartum management to reduce trauma-related bleeding risk.
  • Postpartum hemorrhage risk may extend beyond delivery because factor levels can fall quickly postpartum.

Updated references

Platelet Disorders

Thrombocytopenia is common in pregnancy, but causes range from benign gestational thrombocytopenia to immune thrombocytopenia and severe pregnancy-related microangiopathic disease.

Clinical points

  • Gestational thrombocytopenia is common, but marked thrombocytopenia or bleeding requires broader evaluation.
  • Differentiate immune thrombocytopenia from HELLP syndrome, preeclampsia-spectrum disease, TTP, DIC, and other secondary causes.
  • Platelet count thresholds matter for delivery and neuraxial planning.

Updated references

Antiphospholipid Syndrome

APS remains a key cause of thrombosis and pregnancy morbidity and requires diagnosis grounded in established clinical and laboratory criteria plus individualized anticoagulation planning.

Clinical points

  • Think of APS in pregnancy loss, severe placental disease, or maternal thrombosis with suggestive antibody profile.
  • Management differs for obstetric APS versus thrombotic APS.
  • Care commonly involves low-dose aspirin and heparin-based strategies when criteria are met, with postpartum planning equally important.

Updated references

Coagulation Disorders & Venous Thromboembolism

Pregnancy and the puerperium are hypercoagulable states, and current management emphasizes risk-stratified prophylaxis, prompt diagnosis, and LMWH-based treatment when VTE occurs.

Clinical points

  • LMWH remains the preferred agent for prevention and treatment of most pregnancy-associated VTE scenarios.
  • Not all inherited thrombophilias justify the same antepartum or postpartum prophylaxis strategy.
  • Delivery timing, neuraxial anesthesia, and postpartum anticoagulation require coordinated planning.

Updated references

General Resources

Additional current resources and related Perinatology navigation.

Core hematology resources