American College of Rheumatology/European League against Rheumatism classification criteria for primary Sjogren syndrome

Labial salivary gland with focal lymphocytic sialadenitis and focus score ≥1foci·4mm−23
Ocular staining score ≥5 (or van Bijsterveld score ≥4) in at least one eye1
Schirmer's test ≤5 mm in 5 min in at least one eye1
Unstimulated whole saliva flow rate ≤0.1 mL·min−11

A patient can be classified as having primary Sjogren syndrome with a score of ≥4 and without any of the conditions listed as exclusion criteria. Exclusion criteria include prior diagnosis of any of the following conditions: history of head and neck radiation treatment; active hepatitis C infection; AIDS; sarcoidosis; amyloidosis; graft-versus-host disease; immunoglobulin G4-related disease [12].