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Diagnosis of Systemic Lupus Erythematosus

Systemic lupus erythematosus (SLE) can be difficult to diagnose because:
SLE may be suspected if at least 4 of the following signs are present with no other apparent reason:
Changes in the blood and kidney may be discovered through:

Blood Tests

SLE can cause a variety of changes in the blood that can be different from person to person. Some factors that will be looked for include:
  • Presence of antinuclear antibodies (ANA)—Specific antibodies that attack the contents of your body's cells. These antibodies are believed to be associated with SLE and nearly all people with SLE will test positive.
  • CBC—Measure of all the blood cells.
  • Screen for substances normally filtered out through the kidneys, which shows changes to kidney function

Urine Tests

Presence of proteins, blood, or other substances in the urine may indicate changes in kidney function.


Guidelines for referral and management of systemic lupus erythematosus in adults. American College of Rheumatology Ad Hoc Committee on Systemic Lupus Erythematosus Guidelines. Arthritis Rheum. 1999;42(9):1785-1796.

How is lupus diagnosed? Lupus Foundation of America website. Available at: Updated December 29, 2014.

Lupus. National Institute of Arthritis and Musculoskeletal and Skin Diseases website. Available at: Updated May 2013. Accessed December 29, 2014.

Systemic lupus erythematosus (SLE). EBSCO DynaMed website. Available at: Updated November 24, 2014. Accessed December 29, 2014.

Systemic lupus erythematosus (SLE). The Merck Manual Professional Edition website. Available at: Updated October 2013. Accessed December 29, 2014.

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