Histone Antibody Profile (Serum)

Why This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms like joint pain, fatigue, or unexplained rashes that could suggest an autoimmune disorder. It’s particularly useful in cases where other tests (like antinuclear antibodies) don’t provide a clear answer. Histone antibodies are strongly linked to conditions like systemic lupus erythematosus (SLE) or drug-induced lupus, which can cause similar symptoms but may respond differently to treatment.

What to Expect Before the Test

No special preparation is needed. You’ll likely have a simple blood draw from a vein in your arm. The test involves collecting serum (liquid part of blood after clotting), which is then analyzed for the presence of histone antibodies.

What the Results Mean

Positive results indicate the presence of histone antibodies, which may suggest an autoimmune condition. However, results alone don’t diagnose a disease—they’re usually part of a broader evaluation. Your doctor will consider your symptoms, medical history, and other test results to make a diagnosis.

Common Conditions Linked to Histone Antibodies

Histone antibodies are most strongly associated with **drug-induced lupus** (caused by medications like hydralazine, procainamide, or isoniazid) and **systemic lupus erythematosus (SLE)** in rare cases. They can also appear in other autoimmune conditions, but further testing is needed to confirm.