Thrombotic thrombocytopenic purpura laboratory findings

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Laboratory Findings

• CBC shows:
  • Thrombocytopenia (median platelet count 10,000/microL)
  • Microangiopathic hemolytic anemia:

Hemolytic anemia
LDH ↑ Indirect bilirubin ↑ Serum haptoglubin ↓ Retic count ↑ Combs tests negative Hb ~7 g/dl, Hct ~21%

• Peripheral blood smear: Schistocytes, including helmet cells and triangular cells, polychromasia, microspherocytes and nucleated RBCs
• Urinalysis: Hematuria, proteinuria