An elevation in which of the following laboratory test values would indicate poor renal clearance?

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Serum creatinine is a waste product produced by muscle metabolism and eliminated by the kidneys. An elevation in serum creatinine indicates poor renal clearance, as the kidneys are not effectively filtering out waste products from the body. Blood urea nitrogen and serum chloride can also be indicators of renal function, but they can be affected by factors other than the kidneys, such as liver function or hydration status. Serum magnesium is primarily regulated by the intestines and kidneys, but an elevation in serum magnesium may not necessarily indicate poor renal clearance.

An Elevation in Which of the Following Laboratory Test Values