Which term refers to a blood test to determine kidney function by measuring the level of nitrogenous waste in the blood?

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Multiple Choice

Which term refers to a blood test to determine kidney function by measuring the level of nitrogenous waste in the blood?

Explanation:
Evaluating kidney function by measuring nitrogenous waste in the blood is done with the Blood Urea Nitrogen test. Urea is produced in the liver from ammonia and is normally cleared by the kidneys. The BUN test directly measures how much nitrogen from urea is circulating in the blood. When kidney function declines, urea isn’t cleared as well, so BUN goes up. BUN is helpful, but its level can also be influenced by hydration status, protein intake, and liver function, so it’s often interpreted alongside creatinine. The other terms listed don’t assess kidney function by measuring blood nitrogenous waste: they refer to a prostate condition, a kidney stone, and an infection.

Evaluating kidney function by measuring nitrogenous waste in the blood is done with the Blood Urea Nitrogen test. Urea is produced in the liver from ammonia and is normally cleared by the kidneys. The BUN test directly measures how much nitrogen from urea is circulating in the blood. When kidney function declines, urea isn’t cleared as well, so BUN goes up. BUN is helpful, but its level can also be influenced by hydration status, protein intake, and liver function, so it’s often interpreted alongside creatinine. The other terms listed don’t assess kidney function by measuring blood nitrogenous waste: they refer to a prostate condition, a kidney stone, and an infection.

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