An 84 year old male has been losing mobility and gaining weight over the last two months. The patient also has the heater running in his house 24 hours a day, even on warm days. Which of the following tests is most likely to be performed.

An 84 year old male has been losing mobility and gaining weight over the last two months. The patient also has the heater running in his house 24 hours a day, even on warm days. Which of the following tests is most likely to be performed.

1. 1. Complete blood count (CBC)
2. 2. ECG (electrocardiogram)
3. 3. Thyroid function tests (TST)
4. 4. CT Scan

Answer C: Thyroid function tests (TST)

Weight gain and poor temperature tolerance indicate something may be wrong with thyroid function.