A 50-year-old woman presents for follow-up on recent lab tests obtained at a health maintenance visit. She reports feeling well and denies fatigue, weight changes, constipation, cold intolerance, palpitations, or changes in mood. She was recently diagnosed with subclinical hypothyroidism. 

Which of the following would be her expected lab results?

A. TSH of 8.6, elevated free T4 of 14, which is normal.

B. TSH of less than 0.15, undetectable. Free T4 of 79, markedly elevated.

C. TSH of 24, elevated. A free T4 of three, markedly reduced.

D. TSH of 1.8, which is normal and a free T4 of 14, also normal.

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