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Differentiating Pancytopenia from Other Diseases

  • Pancytopenia must be differentiated from a pseudo-syndromes like pseudo-thrombocytopenia, which is a laboratory artifact from platelet clumping.
  • There are no other mimickers of pancytopenia, as the diagnosis can be unequivocally established by laboratory testing (complete blood count).
Category Etiology Mechanism Congenital Acquried Clinical manifestations Para−clinical findings Gold standard Associated findings
Demography History Symptoms Signs
Lab Findings Imaging
Fever Rash Bleeding BP Splenomegaly Jaundice Other CBC PBS Bone marrow exam PT PTT UA
Bone marrow infiltration Bone marrow failure Destruction/

sequestration/

redistribution

Plt HB WBC
Hematologic disorders Myelodysplastic syndromes (MDS)
  • Bone marrow infiltration
  • Ineffective hematopoiesis
  • Acute leukemias
  • Chronic leukemias/myeloproliferative neoplasms (MPN)
  • Multiple myeloma
  • Metastatic cancer
  • Bone marrow infiltration
  • Ineffective hematopoiesis
+ + +
Myelofibrosis Bone marrow infiltration +
Fanconi anemia +
Aplastic anemia Immune destruction/suppression +
Dyskeratosis congenital/telomere biology disorders +
Shwachman-Diamond syndrome +
Paroxysmal nocturnal hemoglobinuria Immune destruction/suppression +
Disseminated intravascular coagulation Consumption +
Immunology/

Rheumatology

SLE
Felty syndrome
Wiskott Aldrich syndrome +
GATA2 deficiency +
Hemophagocytic lymphohistiocytosis (HLH) +
GI disorders Portal hypertension/cirrhosis Splenomegaly +
Storage diseases (eg, Gaucher)
  • Splenomegaly
  • Bone marrow infiltration
+ +
Infections Sepsis Bone marrow infiltration +
Viral infection such as HIV, hepatitis, Epstein-Barr virus
  • Marrow suppression
  • Splenomegaly
+ +
Nutritional Megaloblastic anemia Ineffective hematopoiesis +
Excessive alcohol Ineffective hematopoiesis
Other (eg, copper deficiency, zinc toxicity) Ineffective hematopoiesis
Malnutrition Ineffective hematopoiesis
Medications Medications such as:
  • Cytotoxic drugs
  • Idiosyncratic reactions to medications
Immune destruction/suppression +
Category Etiology Decreased platelet production Platelet destruction in blood Platelet destruction in spleen Congenital Acquried Demography History Fever Rash Bleeding BP Splenomegaly Jaundice Other signs Plt HB WBC PBS Bone marrow exam PT PTT UA Imaging Gold standard Associated findings