Correct Answer - A Ans is A ie Serum TSH Level 'A normal TS | Surgery videos & books

Correct Answer - A
Ans is A ie Serum TSH Level

"A normal TSH Level excludes primary (but not secondary)
hypothyrodism. If the TSH is elevated a free T4 level is needed to confirm the presence of clinical hypothyrodism, but free T4 is inferior to TSH when used as a screening test, as it will not detect
subclinical or mild hypothyroidism. Circulating free T3 levels are
normal in about 25% of the patients, reflecting adaptive respose to hypothyroidism. T3 measurements are therefore not indicated." -
Harrison "Among the various available serum thyroid function tests, TSH is the most useful to assess gland dysfunction."
Endocrine Surgery of Head & Neck, p 83

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