A nurse is reinforcing teaching with a client who is scheduled for a blood test to measure her thyroid-stimulating hormone (TSH) level. Which of the following statements should the nurse give?

"This test detects antithyroid antibodies in your blood."

"This test measures the amount of thyroid hormone that attaches to a protein in your blood."

"This test measures the absorption of iodine and how it relates to the thyroid gland."

"The test determines whether your thyroid gland is overactive, appropriately active, or underactive."