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In medicine, the urea-to-creatinine ratio (UCR[1]), known in the United States as BUN-to-creatinine ratio, is the ratio of the blood levels of urea (BUN) (mmol/L) and creatinine (Cr) (μmol/L). BUN only reflects the nitrogen content of urea (MW 28) and urea measurement reflects the whole of the molecule (MW 60), urea is just over twice BUN (60/ ...
- What is the urine urea nitrogen test?
- Purpose of a urine urea nitrogen test
- Urine urea nitrogen test process
- Understanding your test results
Your body creates ammonia when it breaks down protein from foods. Ammonia contains nitrogen, which mixes with other elements in your body, including carbon, hydrogen, and oxygen, to form urea. Urea is a waste product that is excreted by the kidneys when you urinate.
The urine urea nitrogen test determines how much urea is in the urine to assess the amount of protein breakdown. The test can help determine how well the kidneys are functioning and whether your intake of protein is too high or low. Additionally, it can help diagnose whether you have a problem with protein digestion or absorption from the gut.
Your doctor will usually recommend a urea test to determine protein levels in the body. The test can determine how much protein you’re eating, and if it’s an adequate amount. In addition, your urea nitrogen levels may rise if you’re going through heart failure or dehydration.
A common test for urea nitrogen is the blood urea nitrogen test, better known as BUN. This article refers to the urine urea nitrogen test, which is performed using a urine sample.
A urea nitrogen test can also:
•assess how well the kidneys are functioning
•determine if you have kidney disease
•monitor your kidney disease
Tips
Wash your hands carefully before and after collecting each sample. Also, make sure that you cap the containers tightly. Label and return the samples to the doctor as instructed. Samples need to be refrigerated during the 24-hour period. On the first day of collection, you won’t collect a sample when you first urinate that morning. Note the time, and then collect all urine for the remaining 24 hours. Once collected, the urine is sent to a laboratory for analysis.
A normal urea level in the urine is 12 to 20 grams over 24 hours. Individual labs may have reference ranges that vary slightly and can be different based on sex or age.
Low levels of urea in the urine may suggest:
•malnutrition
•too little protein in the diet
•kidney disease
High levels of urea in the urine may suggest:
- Rachel Nall, MSN, CRNA
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Dec 15, 2022 · In the United States only the nitrogen component of urea is measured (the blood urea nitrogen, i.e., BUN), which is roughly one-half of blood urea. The normal range for BUN is between 5 – 20 mg/dL [1]. To convert from mmol/L into mg/dL, divide by 0.357. The range is wide because there are many factors that affect blood urea levels [1]: the ...
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Jul 28, 2024 · Elsewhere Urea (U) is expressed as mmol/L. Similarly, Creatinine (Cr) is expressed as mg/dL in the US and µmol/L elsewhere. Conversion: SI to traditional units. Plasma urea: 10 mmol/l = 27.8 mg/100 ml. Plasma creatinine: 100 µ mol/ – 1.13 mg/100 ml. Therefore two ratio’s exist to compare serum Urea and Creatinine levels.
