The Histone test serves to distinguish drug-induced lupus from other forms of lupus, such as systemic lupus erythematosus (SLE), from other autoimmune conditions, or from alternative sources of the patient's symptoms. Although it isn't a definitive diagnostic tool for drug-induced lupus, the presence of histone antibodies aligns with this diagnosis.
This test is typically ordered in conjunction with a positive antinuclear antibody (ANA) test and at times alongside an anti-double-stranded DNA (anti-dsDNA) test to aid in the establishment of a diagnosis.
Upon diagnosing drug-induced lupus, healthcare providers may recommend discontinuing the implicated drug. One or more histone antibody tests can then be employed to monitor antibody levels (titers), if present.
A histone antibody test is requested when an individual has been taking medication for several weeks to a few years and displays signs and symptoms that could be linked to drug-induced lupus. This situation is particularly relevant if the affected person lacks a prior personal or familial history of autoimmune disorders. Symptoms may encompass:
While systemic lupus erythematosus (SLE) can entail symptoms involving the central nervous system (CNS) and kidneys, these are much less common with drug-induced lupus.
After discontinuation of the drug, the histone antibody test may be repeated at intervals to monitor potential decreases in histone antibody levels.
A negative result suggests that the individual's symptoms could stem from a cause other than drug-induced lupus, such as a drug allergy. Nevertheless, a negative outcome does not definitively rule out drug-induced lupus. Some individuals might have drug-induced lupus despite lacking histone antibodies.
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A positive result means that a person likely has drug-induced lupus if the person also has:
- Symptoms associated with lupus
- Been taking a drug, especially one associated with the condition, for several weeks to a couple of years
- No identified autoimmune disorder prior to taking the drug
- Positive ANA test
- Low or negative anti-dsDNA and other autoantibodies
- Signs and symptoms that resolve when the drug is discontinued
- Histone antibody levels that begin to decrease when the drug is discontinued
A positive histone antibody result by itself does not establish a diagnosis. About 50% of those with SLE will have histone antibodies, though generally not induced by a specific drug. In these cases, the anti-dsDNA test will be positive and significantly elevated.
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14.3.3 ETA PROTEIN, Acetylcholine Receptor (AChR) Antibody, Activated partial thromboplastin time (APTT), Alpha 2-Macroglobulins, Qn, Alpha Melanocyte Stimulating Hormone, ANA SCREEN A, ANA SCREEN B, ANA SCREEN, IFA, ANA Screen, IFA (Positive, Negative), ANA titer, Anti-C1Q Ab, IgG (RDL), Anti-DBL-Strand DNA Ab, Anti-dsDNA (Double-stranded) Ab by Farr method (RDL), Anti-dsDNA ab (Farr Assay), Anti-Smith Antibody, Anticardiolipin Ab, IgM, Anticardiolipin Ab,IgA,Qn, Anticardiolipin Ab,IgG,Qn, Antinuclear Antibodies (ANA) Screen, Reflex ANA IFA dsDNA Antibodies, Antinuclear Antibodies Direct (ANA Direct), Antiphosphatidylserine IgA, Antiphosphatidylserine IgG, Antiphosphatidylserine IgM, Baski sleepy, C1 Esterase Inhibitor, Func, C1 Esterase Inhibitor, Serum, C3A Desarg Fragment, C4a Level by RIA, CARDIOLIPIN AB (IGA), CARDIOLIPIN AB (IGG), CARDIOLIPIN AB (IGM), Carnitine Esters, Carnitine, Free, Carnitine, Total, CCP Antibodies IgG/IgA, Centromere, Chromatin, Coccidioides Ab by CF, Coccidioides Ab, IgG, EIA, Coccidioides Ab, IgM, EIA, Complement C1q, Quantitative, Complement C3, Complement C3a, Complement C4, Serum, Complement C4a, Complement Component C1Q, Complement, Total (CH50), Complement, Total (CH50) / Quest, Cyclic Citrullinated Peptide Antibody, Dilute Russell's viper venom time (dRVVT), Diphtheria Antitoxoid Antibody, DNA AB Double Stranded Titer, DNA Double-Stranded Ab, IgG, DRVVT SCREEN, ds-DNA Antibody, IgG, dsDNA, ENA to Smith (Sm) Antibody, Eosinophil Cationic Protein (ECP), Erythrocyte Sedimentation Rate (ESR), Esterified/Free Ratio, F004-IgE Wheat, Free Kappa Lt Chains, Serum, Free Lambda Lt Chains, Serum, Gastrin, GlycA, Hemoglobin A2 (Quant), HISTAMINE RELEASE (CHRONIC URTICARIA), Histamine, Plasma, Histone, HLA-B27 (Human Leukocyte Antigen B27), Human Transforming Growth Factor Beta 1 (TGF-b1), IGE ANTIBODY (ANTI IGE IGG), Immature Grans (Abs), Immature Granulocytes (%), Immunofixation Result, Serum, Immunoglobulin A, Qn, Serum, Immunoglobulin D, Quant, Serum, IMMUNOGLOBULIN E, Immunoglobulin E, Total, Immunoglobulin G, Qn, Serum, Immunoglobulin M, Qn, Serum, Influenza Type A Antibody Serum, Influenza Type B Antibody Serum, Interleukin-2, Serum, Interleukin-6, Jo 1 Antibodies, IgG, Serum, JO-1, Kappa/Lambda Ratio, Serum, Liver Kidney Mic IgG, Liver-Kidney Microsomal Antibodies, Lupus Anticoagulant, Measles Antibodies, IgG, Mumps Abs, IgG, PEP A2Glob, PHOSPHATIDYLETHANOLAMINE AB (IGA), PHOSPHATIDYLETHANOLAMINE AB (IGG), PHOSPHATIDYLETHANOLAMINE AB (IGM), PHOSPHATIDYLSERINE AB (IGA), PHOSPHATIDYLSERINE AB (IGG), PHOSPHATIDYLSERINE AB (IGM), Plasminogen Activator Inhibitor (PAI-1) AG, Procalcitonin, Prothrombin Fragment 1.2, Prothrombin Time (PT), Prothrombin Time (PT) INR, RA Latex Turbid, Reptilase Clotting Time, RF, IgA by EIA (RDL), RF, IgG by EIA (RDL), RF, IgM by EIA (RDL), Rheumatoid factor (RF), RNA Polymerase III Antibodies, RNP/Sm, Scl-70, SICKLE CELL SCRN, Sirolimus, Whole Blood, Sm, SM/RNP Antibody, Smith/RNP (ENA) Ab, IGG, Smooth Muscle Abs, IFA, SSA, SSB, ssDNA, Tacrolimus, Whole Blood, Tetanus Antitoxoid IgG Ab, TGF-b1, Thrombin time, Thrombin-Antithrombin TAT, Trans. Growth Fact. beta 1, Transforming Growth Factor beta, Plasma, Tryptase, Tumor Necrosis Factor, Varicella-Zoster Virus (VZV) DNA, Qualitative, Real-Time PCR, VEGF, Plasma, Von Willebrand Factor Antigen (vWF), vWF Activity
