| Category | Women | Men |
| Grade 0 (normal) | 12.0 to 16.0 g/dl | 14.0 to 18.0 g/dl |
| Grade 1 (mild) | 10.0 to <12.0 g/dl | 10.0 to <14.0 g/dl |
| Grade 2 (moderate) | 8.0 to <10.0 g/dl | 8.0 to <10.0 g/dl |
| Grade 3 (severe) | 6.5 to <8.0 g/dl | 6.5 to <8.0 g/dl |
| Grade 4 (life threatening) | <6.5 g/dl | <6.5 g/dl |
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