The Lab ivestigationofpatient shows|T3,|T4, &|TSH.It cannotbe-

Ans is option 1 - primary hypothyroidism The single most useful measurement for assessment of hypothyroidism is serum TSH. It is increased in primary hypothyroidism. To compensate the reduced T3 and T4 there is a hypersecretion of TSH. Ref Harrison 19 /2289