Discrepancy between free T4 and TSH

Hi all. Need some clarification between free T4 and TSH and which one to use in terms of diagnosing thyroid problems. On NBME 7, 2 year old boy is brought to the physician by his mother. He has a family history of hypothyroidism and thyroiditis. He is at the lower percentile for both height and weight. His mother is concern that he is smaller than his siblings were at the same age. Mother insist to be tested for thyroid problems. Measurement of which of the following serum concentrations... Discrepancy between free T4 and TSH
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