Grading Criteria for Labial Salivary Gland Biopsy Specimens
| Grade | Lymphocytes per 4 mm2 of salivary tissue |
|---|---|
| 0 | Absent |
| 1 | Slight infiltration |
| 2 | Moderate infiltration or less than one focus |
| 3 | One focus |
| 4 | More than one focus |
Focus = aggregate of ⪖50 lymphocytes and histiocytes.