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When a test for total thyroxine (total T4 or T4 radioimmunoassay) or T3 uptake is performed, calculation of the free thyroxine index (FTI) is useful to correct for abnormal results for either total T4 or T3 uptake due to protein binding effects.
Note: Free T4 Index (T7) will only be calculated and reported if test code code 861 (T3 Uptake) is ordered as well.
CPT code 84480 should be used when a clinician orders the measurement of total T3 levels in a patient’s blood to aid in the diagnosis of thyroid disorders. It is important to note that CPT 84480 is specifically for measuring total T3 and not free T3 or reverse T3.
Used for the differential diagnosis of euthyroid hyperthyroxinemia from hyperthyroidism or for the differential diagnosis of euthyroid hypothyroxinemia from hypothyroidism. 7444. Thyroid Panel with TSH Includes T3 Uptake; T4 (Thyroxine), Total; Free T4 Index (T7); TSH.
T4 and T3 cause positive feedback to the pituitary and hypothalamus with resultant suppression or stimulation of the thyroid gland as follows: decrease of TSH if T3 or T4 is high (hyperthyroidism) and increase of TSH if T3 or T4 is low (hypothyroidism). Measurement of total T4 gives a reliable reflection of clinical thyroid status in the ...
Thyroid function which is particularly useful in the diagnosis of T 3 thyrotoxicosis, in which T 3 is increased and T 4 is within normal limits. T 3 toxicosis is occasionally found in Graves' disease.
Thyroid testing from Quest can provide you with the insight you need to diagnose, treat, monitor, and prevent complications related to every type and etiology of the disease—including both Graves’ and Hashimoto’s diseases.
