Anti-JO-1 Antibody

The Anti-Jo-1 Antibody Test is a blood test that detects antibodies directed against the Jo-1 antigen, an enzyme found within muscle cells. These autoantibodies are commonly associated with certain autoimmune inflammatory muscle disorders, particularly polymyositis and dermatomyositis, and may also be seen in antisynthetase syndrome. The test helps healthcare providers investigate unexplained muscle weakness, muscle inflammation, and related lung involvement. When interpreted alongside clinical findings and other laboratory tests, it supports the diagnosis and evaluation of autoimmune connective tissue diseases.

Who Should Get This Test Done?

This test may be recommended for individuals who:

●      Experience persistent muscle weakness or unexplained muscle inflammation.

●      Have symptoms suggestive of polymyositis, dermatomyositis, or antisynthetase syndrome.

●      Develop joint pain, fatigue, or skin changes along with muscle-related symptoms.

●      Have suspected autoimmune-related lung disease or interstitial lung disease.

●      Are being evaluated by a rheumatologist for an autoimmune connective tissue disorder.

Why Consider This Test?

Autoimmune muscle disorders can develop gradually, and their symptoms often overlap with those of other conditions. The Anti-Jo-1 Antibody Test helps identify a specific autoantibody that is strongly linked to inflammatory muscle diseases and certain forms of autoimmune lung involvement. Detecting this antibody provides valuable information that supports diagnosis, helps distinguish between different autoimmune disorders, and assists healthcare providers in planning appropriate treatment and long-term monitoring.

More Information

Anti-Jo-1 is one of the most commonly detected myositis-specific autoantibodies. It is frequently associated with antisynthetase syndrome, a condition that may involve muscles, joints, lungs, and other organs. The test is often performed as part of a broader autoimmune antibody panel and is interpreted together with clinical examination, muscle enzyme tests, imaging studies, and other immunological investigations to provide a comprehensive assessment of the patient’s condition.

Other Names

●      Anti-Jo-1 Antibody Test

●      Anti-Histidyl tRNA Synthetase Antibody Test

●      Jo-1 Autoantibody Test

●      Anti-Jo-1 IgG Antibody Test

●      Jo-1 Antibody, Serum Test