From: Chronic Lymphocytic Leukemia Treatment (PDQ®)
PDQ Cancer Information Summaries [Internet].
Bethesda (MD): National Cancer Institute (US); 2002-.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
Table 1. Rai Staging System
| Stage | Stage Criteria |
|---|---|
| Stage 0 | Absolute lymphocytosis (>15,000/mm3) without adenopathy, hepatosplenomegaly, anemia, or thrombocytopenia. |
| Stage I | Absolute lymphocytosis with lymphadenopathy without hepatosplenomegaly, anemia, or thrombocytopenia. |
| Stage II | Absolute lymphocytosis with either hepatomegaly or splenomegaly with or without lymphadenopathy. |
| Stage III | Absolute lymphocytosis and anemia (hemoglobin <11 g/dL) with or without lymphadenopathy, hepatomegaly, or splenomegaly. |
| Stage IV | Absolute lymphocytosis and thrombocytopenia (<100,000/mm3) with or without lymphadenopathy, hepatomegaly, splenomegaly, or anemia. |