Written by: If you have been diagnosed with hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid), your doctor might order an additional blood test called Anti-TPO (Thyroid Peroxidase Antibodies). While standard thyroid tests (T3, T4, TSH) tell you *how much* hormone is in your blood, antibody tests help determine the *root cause* of the dysfunction.
Understand pituitary feedback loops, T3/T4/TSH correlations, and anti-TPO autoimmune markers. Read the full Thyroid Care Knowledge Hub or view parameters in our Thyroid Profile (T3, T4, TSH).
What are Thyroid Antibodies?
Sometimes, the body's immune system mistakenly identifies the thyroid gland as a foreign threat. It produces antibodies that attack thyroid tissue and enzymes, leading to chronic inflammation. The most common antibody checked is Anti-TPO, which targets thyroid peroxidase, an enzyme essential for thyroid hormone production.
Common Autoimmune Thyroid Conditions
- Hashimoto's Thyroiditis: The immune system gradually destroys the thyroid gland, leading to hypothyroidism. This is the most common cause of hypothyroidism in urban areas.
- Graves' Disease: Antibodies stimulate the thyroid gland to produce too much hormone, causing hyperthyroidism.
Why Test for Thyroid Antibodies?
If you have a border-line TSH report or symptoms of thyroid imbalance but normal T4, testing for Anti-TPO helps confirm if your condition is autoimmune. This assists your doctor in determining long-term treatment and predicting if thyroid issues might worsen over time.
Schedule Autoimmune Screening
Book a specialized Thyroid Antibodies Panel or explore complete health packages with free home sample collection (blood collection is absolutely free of cost).
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