TSH with Free T4
TSH and Free T4 work together to check how well your thyroid is functioning. TSH is typically the first test used to screen for thyroid problems, while Free T4 measures the active thyroid hormone available in your blood. Together, they help evaluate an underactive or overactive thyroid.
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Processed in our own laboratory, not sent to an outside facility.
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Overview
About This Test
TSH (thyroid-stimulating hormone) and Free T4 work together to give a fuller picture of your thyroid function than either test alone. TSH, produced by your pituitary gland, signals your thyroid to produce hormone, and it's typically the first test ordered when a thyroid problem is suspected. Free T4 measures the active thyroid hormone circulating in your blood. Together, these results can help evaluate an underactive thyroid (hypothyroidism), an overactive thyroid (hyperthyroidism), or monitor thyroid hormone replacement therapy.