A patient who has diabetes mellitus needs periodic laboratory evaluation of kidney function.Which one of the following tests is specific in determining how well the kidneys are functioning?

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BUN (Blood Urea Nitrogen) is a measure of the amount of nitrogen in the blood that comes from urea, a waste product of protein metabolism in the liver. It is eliminated by the kidneys, so an elevated level of BUN indicates possible kidney dysfunction. NPH (Neutral Protamine Hagedorn), OGTT (Oral Glucose Tolerance Test), and ECG (Electrocardiogram) are not specific tests for kidney function. HbA1c (Glycated Hemoglobin) is a measure of average blood glucose levels over the past 2-3 months and is used to monitor diabetes control, but it is not specific to kidney function.

A Patient Who Has Diabetes Mellitus Needs Periodic Laboratory Evaluation