CPT Code(s)

84436

Methodology

Immunoassay (IA)

Limitations

Nonthyroidal chronic diseases, nicotinic acid and nutrition may decrease results. Thyrotoxicosis may not always cause abnormal results. Binding protein variations may cause variations in results. Increases may be associated with pregnancy or oral contraceptive use.

Reference Range(s)

Clinical Significance

For diagnosis of hypothyroidism and hyperthyroidism.