Class I

Platelet count ≤50,000/mm³; AST >70 U/L; LDH >600 U/L; evidence of hemolysis on smear

Class II

50,000 - 100,000/mm³; AST >70 U/L; LDH >600 U/L; evidence of hemolysis on smear

Class III

100,000 - 150,000/mm³