Description
Clinical Trends: − The level of T4 in hypothyroid patients is decreased. − The level of T4 in hyperthyroid patients is increased. − In euthyroid individuals the level of T4 is within the normal range. Thyroid binding globulin (TBG) levels have reportedly been elevated by the following conditions: increased estrogens from oral contraceptives, androgens, glucocorticords and pregnancy. Consequently, borderline T4 values should be viewed with caution when any of the above conditions are present