Thyroid function test (TFT)

Thyroid Function Tests

Understanding Your Thyroid Health

About Thyroid Tests

A thyroid function test (TFT) is a biochemical blood test that measures the levels of thyroid hormones in the blood to assess how well the thyroid gland is working. These tests help diagnose conditions like hypothyroidism and hyperthyroidism.

TSH (Thyroid-Stimulating Hormone)

Normal Range: 0.4 - 4.0 mIU/L

High TSH: Hypothyroidism

Low TSH: Hyperthyroidism

Free T4 (Free Thyroxine)

Normal Range: 0.8 - 1.8 ng/dL

High Free T4: Hyperthyroidism

Low Free T4: Hypothyroidism

Free T3 (Free Triiodothyronine)

Normal Range: 2.3 - 4.2 pg/mL

High Free T3: Hyperthyroidism

Low Free T3: May indicate hypothyroidism

Total T4 (Total Thyroxine)

Normal Range: 5.0 - 12.0 μg/dL

Provides overall thyroid hormone levels.

Total T3 (Total Triiodothyronine)

Normal Range: 80 - 200 ng/dL

Provides overall thyroid hormone levels.

Thyroid Antibody Tests

TPOAb (Thyroid Peroxidase Antibodies)

Normal Range: <35 IU/mL

High levels suggest autoimmune thyroid disease (e.g., Hashimoto's thyroiditis, Graves' disease)

TgAb (Thyroglobulin Antibodies)

Normal Range: <20 IU/mL

High levels suggest autoimmune thyroid disease

TSI (Thyroid-Stimulating Immunoglobulin)

Normal Range: <1.3 IU/L

High levels indicate Graves' disease

For accurate diagnosis and treatment, always consult with your healthcare provider.