Question

which of the following diagnostic procedures is not a test of thyroid function?
a thyroid function test
b protein - bound iodine test
c total calcium
d thyroid scan

Explanation:

• Thyroid function test: Directly assesses thyroid function.
• Protein - bound iodine test: Measures iodine bound to proteins, which is related to thyroid hormone synthesis (thyroid hormones contain iodine).
• Total calcium: Measures the total amount of calcium in the blood. Calcium regulation is mainly related to parathyroid hormone (from the parathyroid glands, not the thyroid).
• Thyroid scan: Helps evaluate the structure and function (e.g., uptake of radioactive material which is related to thyroid hormone production) of the thyroid.

Answer:

C. total calcium