Hospital Workup for Pancytopenia

Initial Laboratory Evaluation

The American College of Physicians recommends a complete blood count with differential and platelet count to confirm pancytopenia and assess severity of each cell line 3, 4, 1
The National Comprehensive Cancer Network suggests a peripheral blood smear examination to exclude pseudothrombocytopenia, identify morphological abnormalities, and assess for dysplastic changes 4, 1, 2
A reticulocyte count is recommended by the American Society of Hematology to differentiate between bone marrow production defects versus peripheral destruction 4, 1

The Centers for Disease Control and Prevention recommends HIV and hepatitis C virus testing for all adult patients with pancytopenia, regardless of geographic location 5, 4, 1
The Infectious Diseases Society of America suggests hepatitis B virus screening for patients with pancytopenia 5, 4

The American Society of Hematology recommends vitamin B12 and folate levels to rule out megaloblastic anemia, a common and reversible cause of pancytopenia 1, 2

The American College of Rheumatology recommends antinuclear antibodies (ANA) and anti-dsDNA antibodies when systemic symptoms or clinical features suggest autoimmune disease 4, 1
The American Society of Hematology suggests direct antiglobulin test (Coombs) to rule out concurrent Evans syndrome 5, 4

The National Comprehensive Cancer Network recommends bone marrow aspiration and biopsy simultaneously in most cases of pancytopenia, as aspiration alone may be inadequate 4, 1
The American Society of Hematology suggests morphological assessment, immunophenotyping, cytogenetic analysis, and flow cytometry for bone marrow studies 4, 1, 3

The American College of Radiology recommends a chest X-ray to rule out pulmonary infections, malignancies, or thymoma 5, 2
The National Comprehensive Cancer Network suggests CT chest for all patients with T-cell lineage malignancies 3

The American Society of Hematology recommends glycoprotein-specific platelet antibodies if immune thrombocytopenia component is suspected 4
The National Comprehensive Cancer Network suggests ferritin, triglycerides, and fibrinogen if hemophagocytic lymphohistiocytosis (HLH) is suspected 1

The American College of Physicians recommends a thorough history focusing on medication exposure, lymphocyte-depleting therapies, infection symptoms and exposures, autoimmune disease history, and nutritional status 1, 7
The American Society of Hematology suggests a physical examination to assess spleen and liver size, lymphadenopathy, testicular examination, signs of bleeding, and skin changes 5, 4, 3

The American Society of Hematology recommends hospital admission for patients with newly diagnosed pancytopenia and platelet count <20 × 10⁹/L who are asymptomatic or have minor mucocutaneous bleeding, particularly with social concerns, diagnostic uncertainty, significant comorbidities, or more significant mucosal bleeding 8
The National Comprehensive Cancer Network suggests immediate management considerations, including severe anemia, severe thrombocytopenia, severe neutropenia, temperature monitoring, and strict infection control measures 2, 7