Sjögren's Syndrome Blood Tests
Content last reviewed 2026-09-13 · Educational information — not medical advice
Quick answer
Sjögren's testing detects SSA (Ro) and SSB (La) antibodies — positive in ~70% of primary Sjögren's. The test complements dry-eye/dry-mouth clinical assessment; lip biopsy shows focal lymphocytic sialadenitis when serology is negative but suspicion remains high.
The antibody profile
| Antibody | Prevalence | Notes |
|---|---|---|
| Anti-SSA (Ro60) | ~70% | main serologic marker; also in lupus, neonatal lupus (passes placenta) |
| Anti-SSB (La) | ~40% | highly Sjögren's-specific when SSA+; rarely positive alone |
| ANA | ~80% | positive but non-specific |
| Rheumatoid factor | ~50% | positive in subset with joint involvement |
Diagnostic pathway
Dry eyes (Schirmer test, ocular staining) + dry mouth (unstimulated salivary flow) → serology (SSA/SSB) → minor salivary gland biopsy (focus score ≥1). 2016 ACR-EULAR criteria assign weighted scores across these domains. Seronegative disease confirmed via biopsy when clinical suspicion strong.
Systemic complications screening
Sjögren's extends beyond sicca symptoms: pulmonary (interstitial lung disease — PFT screening), renal (tubulointerstitial nephritis — urinalysis, electrolytes), hematologic (lymphoma risk — annual CBC), and neurologic (peripheral neuropathy) assessments. Annual lymphoma surveillance because marginal-zone lymphoma risk elevates significantly.
Neonatal lupus connection
Anti-SSA-positive mothers carry ~2% risk of neonatal lupus (rash, heart block) — fetal echocardiogram monitoring in pregnancy. Anti-SSB positivity adds minimal independent risk. Most affected babies recover fully except permanent heart block.
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Frequently asked questions
Negative SSA/SSB but terrible dry eyes — not Sjögren's?
Seronegative Sjögren's diagnosed via lip biopsy — ~30% of Sjögren's patients lack SSA/SSB. Alternative: ocular rosacea, medication effects, GVHD.
Does Sjögren's shorten life?
Uncomplicated glandular Sjögren's does not; systemic-organ involvement and lymphoma risk modestly reduce survival in affected subsets.