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. If kidney damage is a concern, ask your doctor what factors may be contributing to the damage and what steps you can take to try to control them.Urine tests may either require a small urine sample or all of the urine a person produces in a 24-hour period. Certain medications, such as some antibiotics.Congestive heart failure or recent heart attack.Dehydration, resulting from not drinking enough fluids or for other reasons.Generally, a high BUN level means your kidneys aren't working well. Infants have lower levels than other people do, and the range in children varies. Urea nitrogen levels tend to increase with age. In general, around 6 to 24 mg/dL (2.1 to 8.5 mmol/L) is considered normal.īut normal ranges may vary, depending on the reference range used by the lab and your age. Results of the BUN test are measured in milligrams per deciliter (mg/dL) in the United States and in millimoles per liter (mmol/L) internationally. You can return to your usual activities immediately. The blood sample is sent to a lab for analysis. What you can expectĭuring the BUN test, a member of your health care team takes a sample of blood by inserting a needle into a vein in your arm. Your doctor will give you specific instructions. ![]() If your blood sample will be used for additional tests, you may need to fast for a certain amount of time before the test. If your blood sample is being tested only for BUN, you can eat and drink normally before the test. The GFR estimates the percentage of kidney function you have. ![]() To do this, you may have a blood sample taken to calculate your estimated glomerular filtration rate (GFR). Your doctor may also test how well your kidneys are removing waste from the blood. High levels of creatinine in your blood may be a sign of kidney damage. ![]() Creatinine is another waste product that healthy kidneys filter out of your body through urine. If kidney problems are the main concern, the creatinine levels in your blood will likely also be measured when your blood is tested for urea nitrogen levels.
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