![]() Urea is made in the liver and passed out of your body in the urine. Urea is a waste product made when protein is broken down in your body. ![]() This test measures the amount of urea in your blood. The test is done on both a blood sample and on a sample of urine collected over 24 hours. This test gives better information than a blood creatinine test on how well your kidneys are working. Creatinine clearanceĪ creatinine clearance test measures how well creatinine is removed from your blood by your kidneys. Men generally have higher creatinine levels than women. The amount of creatinine in the blood depends partly on the amount of muscle tissue you have. A high level may mean that your kidneys aren't working as they should. The blood creatinine level shows how well your kidneys are working. If your kidneys are damaged and can't work as they should, the amount of creatinine in your urine goes down while its level in your blood goes up. Your kidneys take creatinine out of your blood and pass it out of your body in urine. These tests tell how well your kidneys are working.Īnother substance, creatine (say "KREE-uh-teen"), is formed when food is changed into energy through a process called metabolism. This is when a creatinine clearance test is more useful.Creatinine and creatinine clearance tests measure the level of the waste product creatinine (say "kree-AT-uh-neen") in your blood and urine. For example, if your egfr blood test kidney function is very low, or your muscle mass is far lower or higher than average. However, sometimes, the doctor may not completely trust the GFR. It is the speed with which your kidneys can filter waste from your blood. ![]() This is to calculate your GFR or Glomerular Filtration Rate. This can indicate a problem with your kidneys long before any other signs of CKD begin to appear.ĭoctors will usually use additional information, along with the serum creatinine test, to determine your level of kidney function more accurately. This is often used as a preliminary test to determine the health of your kidneys.Īs kidney function decreases, serum creatinine levels will increase. A member of your healthcare team will simply take a blood sample from you and have it analyzed in a laboratory. The serum creatinine test is a common blood test and usually requires no prior preparation. This test measures the creatinine level in your blood. If your kidneys become damaged, the creatinine starts to increase. Your muscles are like the tap, the kidneys are like the drain and the creatinine levels in your blood are like the water. It will continue to rise until a new, higher equilibrium is reached. However, when you partially plug the drain, the water level will rise. When you run the tap of a kitchen sink without plugging the drain, a small layer of water will collect. This means the amount of creatinine in the blood usually increases. When the kidneys are damaged, they filter waste materials less efficiently. This means that the creatinine in your body is at an equilibrium. The special thing about creatinine is that it is produced at a constant rate, and filtered almost freely by the kidneys. This is a job for your kidneys: they filter creatinine out from your blood and excrete it from the body in urine.īy measuring the amount of creatinine found in someone’s body, doctors can get an idea of how well their kidneys are functioning. Like other waste products, the creatinine in your bloodstream has to be removed. It’s normal for everyone to have some creatinine present in their blood. Creatinine is a waste product of the body and is produced mainly through muscle activity. ![]()
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