Healthy kidneys keep the albumin in your blood while filtering the creatinine out into the urine. The urine albumin-creatinine ratio (uACR) test measures the amount of two different substances in your urine – albumin (protein) and creatinine. Last, the sample may be looked at under a microscope for a more detailed look, though not always. The strip changes color in the presence of abnormalities – for example, high amounts of acid, albumin (protein), bacteria, blood, pus, or sugar. Next, a dipstick (chemically treated test strip) is dipped into the urine sample. First, a visual exam is done to check for things like color and how cloudy the sample is. So, your healthcare provider will likely compare your BUN level to your creatinine and eGFR levels when evaluating your kidney health.Ī urinalysis is a simple test that checks a small sample of your urine for many different things. Checking your BUN level is usually not very helpful by itself. A “normal” BUN level varies, and usually increases as you get older. It is removed from the body through the kidneys. Urea nitrogen is a waste product in your blood that comes from the breakdown of protein in the foods you eat. In less common situations where a more accurate measure of your kidney function is needed, your healthcare provider may order a measured GFR (mGFR). An eGFR lower than 15 is a marker of kidney failure. In general, an eGFR value lower than 60 is a sign that the kidneys may not be working properly. For this test, a higher number is better. A “normal” eGFR varies according to age – it decreases as you get older. It can also be calculated using your cystatin C level. It is calculated using your serum creatinine level, age, and sex. The estimated glomerular filtration rate (eGFR) is an estimate of how well your kidneys are removing waste products from the blood. Estimated glomerular filtration rate (eGFR) This test is not as common as the creatinine test and can be more expensive. So, it is another option to use to calculate your eGFR, if needed. Like creatinine, it is also removed from the body through the kidneys. Cystatin CĬystatin C is a protein that is produced by the cells in your body. High creatinine levels can be a sign of acute kidney injury and/or chronic kidney disease. A “normal” creatinine level in the blood is hard to define because it can change depending on your age, sex, body size, and other factors. It is removed from your body through the kidneys. Creatinine is a waste product that comes from the digestion of protein in your food and the normal breakdown of muscle tissue.
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