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Thyroid Function Blood Test

The Thyroid Function Blood Test determines if you have the appropriate amount of thyroid hormones for a healthy metabolism by measuring your thyroid stimulating hormone (TSH), free T3 (FT3), and free T4 (FT4).

Is it for you?

This test looks at symptoms like changes in your weight, energy, mood, skin, or hair that might be brought on by an overactive or underactive thyroid.

This test examines three thyroid hormones, including FT3, which your doctor may not often monitor, and can help explain your systems if you are being treated for an underactive thyroid but are still experiencing symptoms. With this thyroid test, you can determine whether your dose of thyroid medicine, such as levothyroxine, is effective if you already use it.