Creatinine test is a blood or urine test that measures the amount of creatinine in the body. Creatinine is a waste product formed when muscles break down creatine, a substance that provides energy to the muscles. The kidneys filter creatinine from the blood and excrete it through urine. The creatinine level in the blood or urine is an indicator of how well the kidneys are functioning. An increase in creatinine levels can indicate kidney damage or disease. The test is commonly performed as part of a routine health check or when monitoring kidney function in people with diabetes, high blood pressure, or other conditions that can affect kidney health.
