A 45 year old woman with a 10 year history of hypothyroidism presents for follow up care. She's been taking levothyroxine 100 micrograms per day with excellent adherence. Stating "I take the medicine every morning on an empty stomach with a big glass of water.” She states she's generally feeling well, but notices increased fatigue over the past four months, which she attributes to the stress of starting her graduate studies while working full time. The results of today's laboratory testing in...