|Values are valid only on day of printing.|
Monitoring treatment with synthetic hormones (synthetic triiodothyronine will cause a low total thyroxine [T4])
Monitoring treatment of hyperthyroidism with thiouracil and other antithyroid drugs
Total T4 levels offer a good index of thyroid function when the thyroid-binding globulin is normal and nonthyroidal illness is not present
See Thyroid Function Ordering Algorithm in Special Instructions.