The TSH Receptor Antibodies (TRAb) test is a blood test used to detect antibodies that target the thyroid-stimulating hormone (TSH) receptors in the thyroid gland. These antibodies can either stimulate or block the receptor, leading to abnormal thyroid function.
This test is most commonly used to diagnose Graves’ disease, an autoimmune condition that causes overactivity of the thyroid (hyperthyroidism). It may also help differentiate between different types of thyroid disorders and monitor treatment response.
The purpose of this test is to: