A creatinine blood test measures the level of creatinine in the blood.Creatinine levels in the blood can give your specialist data about how well your kidneys are functioning. Every kidney has a large number of little blood-filtering units called nephrons. The nephrons always channel blood through an extremely minor bunch of veins known as glomeruli. These structures channel squander items, abundance water, and different debasements out of the blood. The poisons are put away in the bladder and afterward expelled amid pee. Creatinine is one of the substances that your kidneys typically dispose of from the body. Specialists measure the level of creatinine in the blood to check kidney work. Abnormal amounts of creatinine may show that your kidney is harmed and not working appropriately. Creatinine blood tests are generally performed alongside a few other research center tests, including a blood urea nitrogen (BUN) test and a fundamental metabolic panel (BMP) or complete metabolic panel (CMP). These tests are finished during routine physical exams to assist analyze certain problem and to check for any issues with your kidney function.