science Lab Test

Autoimmune Screen: What Your Results Mean

An autoimmune screen uses inflammatory markers to detect and monitor systemic inflammation that may arise from autoimmune conditions — diseases where the immune system mistakenly attacks the body's own tissues. This panel combines CRP (C-reactive protein, a rapid acute-phase protein that rises within hours of inflammation onset), ESR (erythrocyte sedimentation rate, a slower but broader inflammatory marker), and albumin (a negative acute-phase protein — its level falls during significant inflammation, making it a complementary indicator of inflammatory burden and nutritional impact). Together, these three markers provide a sensitive and multi-dimensional picture of inflammatory activity.

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What It Tests

This panel measures CRP (produced by the liver within hours of an inflammatory trigger — the most sensitive and rapidly responding general marker of acute inflammation), ESR (how quickly red blood cells settle in a tube — a slower marker that reflects chronic or subacute inflammation driven by elevated fibrinogen and other acute-phase proteins), and albumin (produced by the liver but suppressed during inflammation — low albumin alongside high CRP and ESR confirms significant systemic inflammatory burden).

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Why It's Ordered

This panel is ordered to screen for autoimmune conditions such as rheumatoid arthritis, systemic lupus erythematosus (SLE), vasculitis, inflammatory bowel disease, and polymyalgia rheumatica. It is also used to monitor disease activity and treatment response in known autoimmune conditions, distinguish inflammatory from non-inflammatory causes of joint pain or fatigue, and detect occult infection or malignancy causing unexplained systemic inflammation.

Markers in This Test

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Albumin
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CRP (C-Reactive Protein)
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ESR (Erythrocyte Sedimentation Rate)
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Frequently Asked Questions

Can this panel diagnose a specific autoimmune disease? expand_more
No. CRP, ESR, and albumin are non-specific markers — they indicate that inflammation is present but cannot identify its cause. A confirmed autoimmune diagnosis requires disease-specific antibody testing: ANA (antinuclear antibodies) and anti-dsDNA for lupus, rheumatoid factor and anti-CCP for rheumatoid arthritis, ANCA for vasculitis, etc. This panel is used as a first-line inflammatory screen and to guide further targeted testing.
Why is ESR elevated even when CRP is normal? expand_more
CRP and ESR are driven by different mechanisms and respond at different speeds. CRP rises and falls quickly (within 6–12 hours) and reflects the current inflammatory state. ESR lags by days and is influenced by factors such as anaemia, kidney disease, and immunoglobulin levels. A normal CRP with high ESR may suggest a chronic low-grade condition (e.g. multiple myeloma, anaemia, SLE) or a resolving acute process where ESR has not yet normalised.
What level of CRP suggests an autoimmune flare? expand_more
CRP above 10 mg/L generally suggests significant inflammation or infection. In autoimmune diseases, CRP can range from mildly elevated (5–20 mg/L) during low-grade disease activity to very high (above 100 mg/L) during acute flares or intercurrent infection. Notably, CRP tends to be only mildly elevated in SLE flares despite significant disease activity — anti-dsDNA antibodies and complement levels are more useful for monitoring lupus activity.
How does low albumin relate to autoimmune disease? expand_more
During active inflammation, the liver shifts its protein production priorities — increasing acute-phase proteins (CRP, fibrinogen) at the expense of albumin. Low albumin in the context of high CRP and ESR indicates a significant inflammatory burden. In autoimmune diseases such as rheumatoid arthritis or lupus nephritis, albumin can also be lost through a protein-losing nephropathy when the kidneys are inflamed, compounding the deficiency.
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