The Serum Creatinine test measures the level of creatinine in the blood. Creatinine is a waste product generated by muscle metabolism and is typically filtered out of the blood by the kidneys. This test is commonly used to assess kidney function. Elevated serum creatinine levels can indicate impaired kidney function or kidney disease, as the kidneys are unable to efficiently filter out waste products. The test is often used in conjunction with other tests, such as the glomerular filtration rate (GFR), to evaluate the extent of kidney damage or monitor the progression of chronic kidney disease.