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| Stage | Criteria |
|---|---|
| I | Meeting the followings: |
| Hemoglobin >100 g/L | |
| Normal serum calcium | |
| X-ray test shows normal findings or isolated osteolytic lesions | |
| IgG <50 g/L; IgA <30 g/L; Bence-Jones proteins <4 g/24 h | |
| II | Between I and III |
| III | Meeting one of the followings: |
| Hemoglobin <85 g/L | |
| Elevated serum calcium | |
| X-ray test shows multiple osteolytic lesions | |
| IgG >70 g/L; IgA >50 g/L; Bence-Jones proteins >12 g/24 h |
