Thyroid Antibodies Test

Measures TPO antibodies (anti-thyroid peroxidase) and thyroglobulin antibodies — the markers that detect autoimmune thyroid disease, most commonly Hashimoto's thyroiditis. Thyroid antibodies can be elevated for years or decades before TSH becomes abnormal, making this test the earliest possible detection method for the most common cause of hypothyroidism in Australia. Essential for anyone with thyroid symptoms but 'normal' TSH, or family history of thyroid disease.

Thyroid antibodies — specifically TPO antibodies (anti-thyroid peroxidase) and thyroglobulin antibodies — are the earliest markers of autoimmune thyroid disease. They can be elevated for years or even decades before thyroid hormone levels (TSH, T3, T4) become abnormal, making this test the most sensitive early detection method for Hashimoto's thyroiditis, the leading cause of hypothyroidism in Australia. Hashimoto's thyroiditis is an autoimmune condition where the immune system gradually destroys thyroid tissue. The process is slow — antibodies attack the gland over years, and the thyroid compensates by working harder until it can no longer maintain adequate hormone output. During this compensated phase, TSH and thyroid hormones remain normal on standard tests, and patients are told everything is fine despite experiencing fatigue, weight gain, cold intolerance, brain fog, and hair loss. Detecting thyroid antibodies during this pre-clinical phase is valuable because it explains current symptoms (antibodies themselves can cause inflammation and fatigue even before hormone levels drop), provides a clear diagnosis to pursue with an endocrinologist, and opens a window for interventions that may slow disease progression — including selenium supplementation, gluten avoidance (in those with coeliac crossover), vitamin D optimisation, and stress management. No fasting is required for this test. ClearLabs delivers results within 2-3 business days, with antibody levels displayed against reference ranges. This test pairs well with the Thyroid Function Test (TSH, T3, T4) and the Thyroid Energy Panel for a complete picture of both thyroid function and autoimmune status.