This test identifies antibodies directed against histones, which are proteins that package DNA into chromosomes.
Diagnostic Value: Anti-Histone antibodies are highly associated with Drug-Induced Lupus (DIL) — a lupus-like condition triggered by certain medications such as hydralazine, procainamide, or isoniazid. They can also be present in Systemic Lupus Erythematosus (SLE).
Clinical Significance: The presence of these antibodies helps distinguish drug-induced lupus from idiopathic lupus and can guide treatment decisions such as stopping the triggering medication.
Symptom Correlation: Patients may present with joint pain, fever, fatigue, or rash, typically without severe kidney or central nervous system involvement.
The Histone Antibody test plays an important role in differentiating lupus types and ensuring timely treatment adjustments.