Thyroid & calcium disorders Practice Test

A 72-year-old man is in the intensive care unit for severe pneumonia and septic shock. A set of thyroid function tests is ordered as part of a routine workup. The results are: TSH 0.6 µIU/mL (normal 0.4-4.0), free T4 0.8 ng/dL (normal 0.8-1.8), and total T3 40 ng/dL (normal 80-200). The patient has no prior history of thyroid disease.

A 68-year-old woman presents for a follow-up appointment. Routine labs were drawn last week. She feels well and has no specific complaints. Her medical history is significant for hypertension. Labs show a TSH of 12.5 µIU/mL (reference range 0.4-4.0 µIU/mL) and a normal free T4 level. A repeat TSH level today is 11.8 µIU/mL.