A 25-year-old woman at 12 weeks gestation comes to the obstetrician for prenatal care. Physical examination shows no abnormalities. Vitals are within normal limits. Thyroid studies show: total thyroxine (T4) 15 μg/dL (NR 5-12); thyroid-stimulating hormone (TSH) 3 μU/mL (NR 0.5-5.0). Which of the following best explains these results?
Androstenedione
Dehydroepiandrosterone sulfate (DHEA-S)
Estrogen
Oxytocin
Progesterone
Prolactin
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Cut-to-the-chase Answer (0:56):
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HY USMLE Answer (6:53):
