TSH and Free T4 Most Popular

The TSH and Free T4 test contains 1 test with 2 biomarkers.

A TSH and Free T4 test is a blood test that measures levels of thyroid stimulating hormone (TSH) and thyroxine free (Free T4) levels in your blood's serum. This test is used to screen for and monitor thyroid disorders such as hypothyroidism and hyperthyroidism.

The following is a list of what is included in the item above. Click the test(s) below to view what biomarkers are measured along with an explanation of what the biomarker is measuring.

T4, Free

The free T4 test is not affected by protein levels. Since free T4 is the active form of thyroxine, the free T4 test is may be a more accurate reflection of thyroid hormone function.


A TSH test is a lab test that measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland. It tells the thyroid gland to make and release thyroid hormones into the blood.
*Process times are an estimate and are not guaranteed. The lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.

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