A blood test that gives the direct measurement of the amount of T₄ in the blood is A)thyroid-stimulating hormone level. B)thyroxine level. C)radioactive iodine uptake. D)fasting blood sugar.

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Thyroxine (also known as T4) is the main hormone produced by the thyroid gland, and its levels can be directly measured through a blood test. T₄, while not a recognized medical term or abbreviation, appears to be a jumble of letters and numbers that does not correspond to any relevant hormone or marker that would be tested in a blood test. Thyroid-stimulating hormone (TSH) levels and radioactive iodine uptake are other tests used to assess thyroid function, but they do not directly measure thyroxine levels. Fasting blood sugar is a test used to screen for diabetes and measures glucose levels in the blood, which is unrelated to thyroid function.

A Blood Test That Gives the Direct Measurement of the Amount