- Mild 1-1.5 × 109/L; does not impair host defense.
- Moderate 0.5-1 × 109/L; slight increased risk of infection if other arms of immune system also impaired.
- Severe < 0.5 × 109/L; increased risk of infection in most patients.
- Agranulocytosis ≤ 0.2 × 109/L; risk of severe, life-threatening infections.
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