Which term describes a test result that reflects kidney function by measuring creatinine in the blood?

• A. Serum Creatinine
• B. Hepatic Enzymes
• C. Serum Calcium
• D. Serum Potassium

Answer: (A)

Creatinine in the blood is a direct marker of kidney filtration. It is produced at a fairly constant rate and is cleared from the body almost entirely by the kidneys. When kidney function is normal, serum creatinine stays low; when kidney performance declines, creatinine builds up in the blood, making the serum creatinine value rise. This is why the test result described as measuring creatinine in the blood is called serum creatinine, and it’s a standard way to assess kidney function and estimate GFR.

The other options relate to different bodily systems: hepatic enzymes reflect liver function, while serum calcium and serum potassium measure minerals/electrolytes rather than filtration capacity.