Platform
Company
Endocrine & Reproductive
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Currently under review
Pending specialist review and validation.
The TSH-receptor antibody test measures autoantibodies that bind to the thyroid-stimulating hormone receptor on thyroid cells. These antibodies can stimulate the receptor and increase thyroid hormone production, or less commonly block the receptor and reduce signaling.
Doctors use this blood test to help evaluate autoimmune thyroid conditions, most notably Graves disease. It can support the diagnosis when your thyroid hormone tests suggest overactivity and can help distinguish autoimmune causes from other thyroid problems.
Results can confirm an autoimmune cause of hyperthyroidism, guide treatment choices, and help estimate the chance of relapse after therapy. Your clinician may order this test at diagnosis, during treatment follow-up, before stopping antithyroid medication, or if symptoms return after radioiodine or surgery.
During pregnancy, this test helps assess the risk of fetal or newborn thyroid effects, since these antibodies can cross the placenta. It may also inform monitoring for thyroid eye disease and clarify complex cases where symptoms and routine tests do not align.
A positive or higher result supports an autoimmune process such as Graves disease, while a negative result does not completely rule it out because antibody levels can fluctuate or be lowered by treatment. Your healthcare team will interpret the result alongside your symptoms, exam, and other tests like TSH and free thyroid hormones, and sometimes imaging.
If you are pregnant or planning pregnancy, your team may repeat testing and arrange monitoring for you and the baby if indicated. If results change over time, your clinician may adjust medications or follow-up. Do not start or stop supplements or medicines without medical advice, since some can affect testing or thyroid status.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
High-dose biotin can interfere with certain immunoassays that use biotin-streptavidin chemistry. Tell your clinician about supplements, and follow the lab’s guidance on pausing biotin before blood draw.
Antithyroid drugs, glucocorticoids, radioiodine, or thyroid surgery can lower or change antibody levels over time. Share recent treatments and timelines so results are interpreted appropriately.
These antibodies can cross the placenta. Levels in a pregnant patient can inform fetal and newborn monitoring, and timing of testing during pregnancy may affect interpretation.
Hashimoto thyroiditis and mixed antibody patterns may yield low-level or fluctuating results. Clinicians consider anti-TPO and anti-thyroglobulin antibodies and the clinical picture.
Drugs such as immune checkpoint inhibitors, interferons, or rituximab can trigger or alter thyroid autoimmunity and may influence test results and timing of follow-up.
Different laboratories use different methods that report results on slightly different scales. Repeating tests in the same lab and at consistent points in therapy aids comparison.
References