FT4 + TSH

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What is this Test About?
TSH is an early indicator of decreased thyroid reserve. This assay helps to diagnose hypothyroidism and hyperthyroidism, monitors T4 replacement or T4 suppressive therapy and quantifies TSH levels in the subnormal range. Free T4 is the metabolically active fraction of thyroxine. FT4 along with TSH gives an accurate picture of thyroid status in patients with abnormal thyroid binding globulin (TBG) like in pregnancy and individuals on treatment with estrogens, androgens, phenytoin or salicylates. This assay is useful for diagnosing both Hypo / Hyperthyroidism.
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