You can learn more about how we ensure our content is accurate and current by reading our editorial policy. We link primary sources - including studies, scientific references, and statistics - within each article and also list them in the resources section at the bottom of our articles. Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. A diet that is very high in protein diet may also affect levels.ĭoctors will typically compare these results to the results of a creatine test to get a better understanding of how well the kidney is filtering this waste. With that said, many other things can affect BUN levels, such as medications or antibiotics. Higher values could be a sign of an underlying condition affecting the kidneys. Urea nitrogen occurs as proteins from food break down, and elevated levels may be a sign that the kidney is not filtering these waste products effectively.Ī typical BUN level falls between 7 and 20 milligrams per deciliter. The blood urea nitrogen (BUN) test checks for other waste products in the blood, such as urea nitrogen. A GFR around 60 or below is a sign of kidney problems. The GFR test takes the results of a serum creatine test and adjusts them for a number of other factors, such as age, gender, and race. These numbers may rise further as kidney disease progresses.ĭoctors may also calculate a person’s glomerular filtration rate (GFR) using this test to confirm their diagnosis or order more tests to check their results. The National Kidney Foundation note that serum creatine levels above 1.2 for women or 1.4 for men may be an early sign that the kidneys are not functioning as they should. Doctors will also order a serum creatine test as part of the creatine clearance test. Serum creatine levels that are too high may be a sign that the kidneys are having trouble doing their job. Share on Pinterest High serum creatine levels are a potential symptom of kidney disease. This comparison shows how much waste the kidneys are filtering out, which may be an indicator of their overall health. It involves collecting all the urine a person creates in 24 hours, as well as taking a small blood sample.Ĭreatine is a waste product in the body that occurs naturally from daily use in the muscles.ĭoctors compare the amount of creatine in the urine sample to the levels of creatine in the blood. Creatine clearance testĪ creatine clearance test is both a blood and urine test. People who are at higher risk for kidney disease may need to take a microalbuminuria test even if other urine protein tests come back negative. The microalbuminuria is a much more sensitive test, which can detect even tiny amounts of the protein in the urine. Anything higher than this may be a sign of kidney disease. If the kidneys filter too much albumin out in the urine, it may be a sign that they are not doing their job correctly.Ī urine albumin result of 30 milligrams per gram (mg/g) or less is normal. They both help identify levels of albumin in the urine.Īlbumin is an important protein in the blood. These two tests require a small urine sample. Microalbuminuria or albumin-to-creatine ratio tests If the test comes back positive for one or more of these particles, it may indicate an underlying issue, such as: Urinalysis may help identify many undesirable particles in the urine, such as: Urinalysis is a broad urine test that helps doctors identify underlying issues or determine which test to use next. Urine tests may either require a small urine sample or all of the urine a person produces in a 24-hour period.
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