Creatinine is described as which of the following?

Creatinine is described as which of the following?

• A. A nitrogenous waste excreted in the urine
• B. Measurement of urea levels in blood
• C. An electrolyte
• D. A protein

Answer: (A)

Creatinine is a nitrogenous waste produced from muscle metabolism and is excreted by the kidneys in the urine. This makes it a useful indicator of kidney function because its production is relatively constant and it is cleared by glomerular filtration. The best description among the options is that it is a nitrogenous waste excreted in the urine. It is not a measure of urea levels in blood (that would be urea or BUN), not an electrolyte, and not a protein.

Creatinine is a nitrogenous waste produced from muscle metabolism and is excreted by the kidneys in the urine. This makes it a useful indicator of kidney function because its production is relatively constant and it is cleared by glomerular filtration. The best description among the options is that it is a nitrogenous waste excreted in the urine. It is not a measure of urea levels in blood (that would be urea or BUN), not an electrolyte, and not a protein.