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Below are the key blood tests used to assess thyroid health, each focusing on a specific hormone or indicator. Please confirm the package you are looking for.
Anti-Thyroglobulin Antibodies (Anti-Tg) target thyroglobulin, a protein in the thyroid gland. Their presence suggests autoimmune thyroid diseases like Hashimoto’s thyroiditis or Graves’ disease. They help diagnose and monitor thyroid dysfunction and autoimmune activity.
Free T3 (Triiodothyronine) measures the active form of T3 hormone in the blood, which helps regulate metabolism. It’s used to assess thyroid function, especially in suspected hyperthyroidism. Abnormal levels indicate thyroid imbalance or dysfunction.
Thyroid Stimulating Hormone (TSH) is produced by the pituitary gland and regulates thyroid hormone production (T3 and T4). High TSH suggests hypothyroidism (underactive thyroid), while low TSH indicates hyperthyroidism (overactive thyroid). It’s the primary test for assessing thyroid function.
Thyroxine (T4) is a primary thyroid hormone that regulates metabolism, heart rate, and growth. It circulates mostly bound to proteins, with a small active free portion (Free T4). Abnormal T4 levels help diagnose thyroid disorders—high in hyperthyroidism, low in hypothyroidism.
Thyroid peroxidase (TPO) is an enzyme essential for producing thyroid hormones (T3 and T4). The presence of antibodies against TPO (Anti-TPO) indicates autoimmune thyroid diseases like Hashimoto’s thyroiditis or Graves’ disease and helps assess thyroid dysfunction.
TSH Receptor Antibodies (TRAb) are autoantibodies that target the thyroid-stimulating hormone receptor. They play a key role in Graves’ disease by stimulating the thyroid, causing hyperthyroidism. Measuring TRAb helps diagnose and monitor this autoimmune thyroid disorder.
Anti-Thyroid Peroxidase Antibodies (Anti-TPO) target an enzyme crucial for thyroid hormone production. Elevated levels are commonly seen in autoimmune thyroid disorders like Hashimoto’s thyroiditis and Graves’ disease, aiding diagnosis and monitoring of thyroid dysfunction.
Free T4 (Thyroxine) measures the unbound, active form of the thyroid hormone T4 in the blood. It helps evaluate thyroid function. High levels suggest hyperthyroidism; low levels indicate hypothyroidism. It's often assessed alongside TSH for accurate diagnosis.
Free Tri-iodothyronine (FT3) measures the active form of T3, a key thyroid hormone that regulates metabolism. It’s often tested with TSH and Free T4 to evaluate thyroid function. Elevated FT3 may indicate hyperthyroidism; low levels suggest hypothyroidism or poor conversion from T4.
Thyroglobulin antibodies (TgAb) are immune proteins that target thyroglobulin, a key thyroid protein. Their presence suggests autoimmune thyroid diseases like Hashimoto’s thyroiditis or Graves’ disease. They are also used to monitor thyroid cancer recurrence after treatment.
Total T3 measures both bound and free triiodothyronine (T3) hormone in the blood. It helps evaluate thyroid function, with high levels indicating hyperthyroidism and low levels suggesting hypothyroidism or thyroid hormone deficiency.
Advanced Thyroid Function Test
Intermediate-level blood test for assessing thyroid function with common autoimmune tests.
- Thyroid Stimulating Hormone Tri-iodothyronine (FT3)
- Free Thyroxine (FT4)
- Anti-Thyroglobulin Antibody (Anti-Tg)
- Anti-Thyroid Peroxidase Antibody (Anti-TPO)
Thyroid Function Blood Test
Basic thyroid blood test checking essential levels, useful if monitoring response to thyroid medication.
- Thyroid-Stimulating Hormone (TSH)
- Thyroxine (T4)
Ultimate Thyroid Function Blood Test
Comprehensive thyroid blood test including common autoantibodies which can target the thyroid gland.
- Thyroxine (T4)
- Thyroid Stimulating Hormone (TSH)
- Free T3 (Triiodothyronine)
- Total T3 (Triiodothyronine)
- Free T4 (Thyroxine)
- Thyroglobulin Antibodies
- Thyroid Peroxidase
- TSH Receptor Antibodies
Common Q&A about Thyroid Health Blood Tests
Our FAQ section is designed to address common questions you may have, from how our treatments work to what you can expect during and after your session.
Our team is always available to provide additional support if you need more personalised guidance, ensuring that you feel informed and confident every step of the way.
Thyroid blood tests are a series of diagnostic tests that measure various hormones and antibodies in the blood to assess thyroid function. These tests help diagnose thyroid disorders, such as hypothyroidism, hyperthyroidism, Hashimoto’s thyroiditis, and Graves' disease, and guide appropriate treatment.
The Thyroid Stimulating Hormone (TSH) test measures the level of TSH in your blood, which is produced by the pituitary gland to regulate the production of thyroid hormones (T3 and T4) by the thyroid gland. Abnormal TSH levels can indicate an underactive thyroid (hypothyroidism) or an overactive thyroid (hyperthyroidism).
T4, or thyroxine, is the main hormone produced by the thyroid gland. It is measured in its total (T4) and free (Free T4) forms. Total T4 includes both bound and unbound hormone, while Free T4 measures the unbound hormone, which is biologically active. Low T4 levels may indicate hypothyroidism, while high levels could suggest hyperthyroidism.
Free T3 measures the unbound, active form of triiodothyronine (T3), while Total T3 measures both bound and unbound T3 in the blood. Free T3 is more indicative of the hormone available for the body’s use, making it crucial for assessing thyroid function, particularly in cases where T4 levels are normal but symptoms persist.
Reverse T3 (rT3) is an inactive form of T3 that the body produces under certain conditions, such as stress or illness. Testing rT3 can help diagnose conditions where the body is not converting T4 into the active T3 properly, leading to symptoms of hypothyroidism despite normal TSH and T4 levels.
Free T4 and Free T3 are important because they measure the levels of unbound, active thyroid hormones in the blood. These free hormones are what the body uses to regulate metabolism, energy levels, and other vital functions. Abnormal levels of Free T4 and Free T3 can indicate thyroid dysfunction even when Total T4 and TSH levels appear normal.
Thyroglobulin Antibodies (TgAb) are antibodies that target thyroglobulin, a protein produced by the thyroid gland. The presence of these antibodies can indicate autoimmune thyroid disorders such as Hashimoto's thyroiditis or, less commonly, Graves' disease. Elevated levels of TgAb can suggest thyroid inflammation or damage.
Thyroid Peroxidase (TPO) antibodies are antibodies that attack the thyroid peroxidase enzyme, which is crucial for the production of thyroid hormones. High levels of TPO antibodies are commonly found in autoimmune thyroid diseases like Hashimoto's thyroiditis and can lead to hypothyroidism as the immune system gradually destroys thyroid tissue.
TSH Receptor Antibodies (TRAb) are antibodies that can either stimulate or block the thyroid-stimulating hormone receptor. They are most commonly associated with Graves' disease, an autoimmune disorder that causes hyperthyroidism. Elevated levels of TRAb indicate that the immune system is attacking the thyroid gland, leading to overproduction of thyroid hormones.
If your thyroid blood test results are abnormal, consult with your healthcare provider or an endocrinologist. They will discuss your results and may recommend further testing, lifestyle changes, medication, or treatment plans tailored to address your specific thyroid condition.
