Blood Urea Nitrogen is the product from metabolism of proteins by the liver and is excreted by the kidneys. It helps measure kidney function. Which test is this?

• A. Creatinine
• B. Sodium
• C. Glucose
• D. Blood Urea Nitrogen

Answer: (D)

Blood Urea Nitrogen measures nitrogen from urea, a waste product formed in the liver from protein metabolism, and cleared by the kidneys. This makes it a marker of kidney function, since higher levels indicate reduced renal clearance or changes in protein metabolism and hydration. The description fits this test because it specifically highlights a liver-produced waste product excreted by the kidneys to assess renal function. Creatinine is also tied to kidney function but comes from muscle metabolism, while sodium is an electrolyte and glucose measures blood sugar. Therefore, the test described is Blood Urea Nitrogen.