Creatinine is a waste product produced by your muscles as part of everyday activities. Normally, your kidneys filter creatinine from your blood and send it out of the body in your urine. If there is a problem with your kidneys, creatinine can build up in the blood, and less will be released in urine.
Creatinine is created as a waste byproduct of normal muscle activity. The kidneys remove creatinine from the blood and allow it to be eliminated from the body in the urine. A creatinine clearance test provides information about how well the kidneys are filtering the blood and can be important for detecting and monitoring kidney problems.
Your kidneys have tiny filters called glomeruli. These filters help remove waste and excess fluid from the blood. A GFR test estimates how much blood passes through these filters each minute. A glomerular filtration rate (GFR) is a blood test that checks how well your kidneys are working
Albumin is the main protein found in blood. When healthy kidneys clean waste from your blood, just a trace of albumin, or none at all, will get through the filters. Hence, small amounts of albumin in urine, sometimes called microalbumin, may be one of the first signs of kidney disease. Microalbumin creatinine ratio urine test is a way of checking for very small amounts of albumin in a sample of your urine.