Summary of Laboratory Tests in Hypothyroidism
From the preceding discussion, several conclusions seem warranted: 1. Serum T4 is the most widely used screening test for hypothyroidism, but some physicians use FT4 or serum TSH assay instead. Values in the upper half of the T4 and FT4 reference range are strong evidence against hypothyroidism unless the TBG level is increased (congenital, pregnancy, […]