![]() ![]() We concluded that the normal range of BUN and Cr levels differed between young and elderly subjects, and that the decline in renal function correlated with age after the seventh decade. Although Cr levels did not correlate with age in elderly subjects, Cr levels divided by body surface area significantly correlated with age. Significant positive correlation was found between BUN levels and age in male elderly subjects. The mean Cr level in the elderly subjects was slightly higher than that in the control subjects. The mean BUN level in the elderly subjects was significantly higher than that in the control young subjects. Hence, a normal BUN-creatinine ratio lies between 10:1 and 20:1. The estimated normal range of BUN was 14-23 mg/dl both in male and female elderly subjects, and that of Cr was 0.9-1.3 mg/dl in male and was 0.7-1.1 mg/dl in female. A normal serum creatinine value is 0.51.2 mg/dl. BUN and creatinine are measured in serum, usually in mg/dL. In children, a BUN-to-creatinine ratio of 30 or greater has a sensitivity of 68. Reference Range for BUN/Creatinine Ratio. We defined the normal range as range within the single SD-line of the remainder. The ratio is may also be useful for diagnosing gastrointestinal bleeding in some patients who do not present with overt blood loss. Get Started What is the BUN/Creatinine Ratio The Blood urea nitrogen (BUN): Creatinine Ratio BUN/Creatinine Ratio is a renal (related to kidneys) function indicator, commonly used to diagnose acute or chronic renal (kidney) disease or damage. We calculated the mean and the standard deviation (SD) in each group, and excluded subjects with values beyond twice the SD-line. ![]() Lack of water in your body will drive these numbers higher as blood flow to the kidneys gets. This study was a part of the Kahoku Longitudinal Aging Study (KLAS) that aims to reveal the comprehensive functions in the aged. Typically, your BUN/creatinine ratio should be about 10:1 or 20:1. The ratio of BUN: creatinine can be useful to differentiate pre-renal from renal causes when the BUN is increased. We measured the variables also in 315 cases of sex-matched young control subjects (male, 139 female, 176). Parameter: US units: SI units: Blood Urea Nitrogen (BUN) 7 30 mg/dL: 2.5 10.7 mmol/L : Creatinine: 0.7 1.2 mg/dL: 62 106 µmol/L. To estimate normal ranges of blood urea nitrogen (BUN) and serum creatinine (Cr) levels in the aged, we measured BUN and Cr levels in 332 cases of apparent-healthy elderly subjects (male, 152 female, 180) aged 70 years or more. Reference Range for BUN/Creatinine Ratio. ![]()
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