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International Staging System
| Stage | Description |
|---|---|
| I | Serum β2-microglobulin < 3.5 mg/L and serum albumin ≥ 3.5 g/dL |
| II | Serum β2-microglobulin < 3.5 mg/L and serum albumin < 3.5 g/dL or serum β2-microglobulin 3.5 to < 5.5 mg/L |
| III | Serum β2-microglobulin ≥ 5.5 mg/L |
