T4 is one of two major hormones produced by the thyroid gland (the other is called triiodothyronine, or T3).
A free T4 test may be ordered when a person has symptoms of hyperthyroidism or hypothyroidism, particularly if the TSH test is out of range.
Fasting Required: No
CPT Code: 84436
Walk-in or call 303-552-0657 to schedule an appointment.