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Rai Staging System for Chronic Lymphocytic Leukemia (CLL)
Clinical stage and risk group in CLL based on lymphadenopathy, organomegaly, anemia, and thrombocytopenia.
Rai Staging System for Chronic Lymphocytic Leukemia (CLL)
Lymphadenopathy present
Any palpable lymph node group >=1 cm.
Hepatomegaly and/or splenomegaly
Anemia (hemoglobin <11 g/dL)
Thrombocytopenia (platelets <100 x10⁹/L)
ResultRai stage 0
Modified risk group: low risk.
- Stage
- 0
- Risk group
- Low
When to use
- Clinical staging of CLL at diagnosis (assumes lymphocytosis with or without bone marrow lymphocytic infiltration is already established).
Formula
Stage 0: lymphocytosis only. Stage I: + lymphadenopathy. Stage II: + hepato/splenomegaly. Stage III: + anemia. Stage IV: + thrombocytopenia. Highest applicable feature determines stage; modified risk groups: low (0), intermediate (I-II), high (III-IV).