DEAR DR. ROACH: I'm female, 68 years old with hypothyroidism but no other medical problems. I exercise about 10 hours a week and try to eat healthy. During one of my physical checkups, my TSH was 0.002, so I saw an endocrinologist. After three months of blood tests, everything became normal even without medicine. My T4, T3, TSH and complete metabolic panel results all are in the normal range. The one that is not is the TPO level, which is greater than 600. She asked me to take 25 mcg of levothyroxine once a day.