Question: A 22-year-old woman presents to her obstetrician/gynecologist for follow-up 8 weeks after the delivery of her baby. There were no complications during her pregnancy or during delivery. On this visit, her thyroid gland is diffusely, but minimally enlarged and non-tender to palpation. The doctor decides to obtain a thyroid function panel to aid her diagnostic evaluation. In this thyroid function panel, the most sensitive indicator of thyroid function is: Question options: a) T3/T4 ratio. b) T3 uptake. c) Total T4. d) TSH.