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Lab Result Guides

What does your lab result actually mean?

Plain-English guides to the blood tests most commonly ordered in autoimmune and rheumatic disease. Select the test on your lab report to get started.

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Autoimmune antibodies
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Guide available
Antinuclear Antibody
ANA
The most common screening test for autoimmune disease. A positive ANA is found in many healthy people and in several autoimmune conditions. Learn what your titer and pattern actually mean.
Lupus (SLE) Sjogren's Scleroderma Myositis MCTD
Read the guide → Titer + pattern interpreter
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In-depth guide
What Does a Positive ANA Mean?
ANA Interpretation Guide
A positive ANA does not mean lupus. This guide explains what titers and patterns actually mean, which conditions they point to, and what the evidence-based next steps are.
Lupus (SLE) Sjogren's Scleroderma MCTD
Read the guide → Patterns, titers, next steps
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Guide available
Rheumatoid Factor and Anti-CCP
RF & Anti-CCP
The two main antibody tests ordered when rheumatoid arthritis is suspected. RF is common but nonspecific. Anti-CCP is more specific for RA. Learn how to read them together.
Rheumatoid arthritis Early RA Seronegative RA
Read the guide → All 4 result combinations
Inflammation markers
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Guide available
CRP and ESR
CRP & ESR (Sed Rate)
Two of the most commonly ordered tests in medicine. Both measure inflammation, but they work differently and can sometimes tell different stories. Learn what your numbers mean and when they matter.
All autoimmune conditions Infection Disease monitoring
Read the guide → Age-adjusted ESR interpreter
Interpretation tools
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Interactive tool
Autoimmune Antibody Interpreter
Full workup interpreter
Got a positive antibody back and not sure what it means? Search any antibody for evidence-based next steps, or select everything that came back positive to get a synthesized pattern analysis.
ANA patterns ENA panel ANCA Antiphospholipid RF / Anti-CCP
Open tool → Search or combine positives
A note on lab results in autoimmune disease: Most of the tests on this page are signals, not diagnoses. A positive or elevated result opens a conversation with your doctor. It does not confirm any condition on its own, and a normal result does not always rule one out. The clinical picture, including your symptoms and physical exam, always takes precedence over any single number.
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Next step
Have results but not sure what questions to ask your doctor? Use the Appointment Prep tool.
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Disclaimer: This page was created by Mahiar Rabie, MD, MS using current medical evidence and guideline-based sources. It is intended to inform and educate, not to replace the advice, diagnosis, or treatment of a qualified physician. Always consult your doctor with questions about your specific results and health situation.