Thyroid Panel: TSH, Free T4, and FT3 (fingerstick)

What is the Thyroid Function Test?

The Thyroid Function Test is a blood test that measures how well your thyroid gland is working. The thyroid plays a key role in regulating metabolism, energy, and overall bodily functions. The test measures the following biomarkers:

• TSH (Thyroid Stimulating Hormone): Regulates the production of thyroid hormones. Elevated TSH levels may indicate hypothyroidism (underactive thyroid), while low TSH levels may suggest hyperthyroidism (overactive thyroid).
• Free T4 (Free Thyroxine): The main thyroid hormone that controls the rate of metabolic processes in the body.
• Free T3 (Free Triiodothyronine): The active form of the thyroid hormone, responsible for stimulating energy production and oxygen use in cells.

Why should you take the Thyroid Function Test?

Testing TSH, Free T4, and Free T3 is essential for detecting and managing thyroid imbalances. It is especially useful for people who:

• Experience fatigue, weight changes, or mood fluctuations.
• Show symptoms of a slow or overactive metabolism.
• Have a family history of thyroid disorders.
• Are taking thyroid medication and need monitoring.

What does it indicate?

The Thyroid Function Test helps determine whether your thyroid produces too many or too few hormones, directly affecting:

• Energy levels and metabolism.
• Weight regulation and digestion.
• Heart rate and temperature control.
• Concentration and mood.

What does a high thyroid level mean?

High TSH levels may indicate hypothyroidism (underactive thyroid), where too little hormone is produced. High Free T4 or Free T3 levels may indicate hyperthyroidism (overactive thyroid), where too much hormone is produced.

What does a low thyroid level mean?

Low TSH levels may indicate hyperthyroidism, while low Free T4 or Free T3 levels usually suggest hypothyroidism. Both conditions require medical follow-up and appropriate treatment.