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. Other names for an electrolyte panel test include: Electrolyte blood test. Certain conditions, including dehydration, cardiovascular disease and kidney disease, can cause electrolyte levels to become too high or low. 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. An electrolyte panel is a blood test that measures the levels of seven electrolytes in your blood. We defined the normal range as range within the single SD-line of the remainder. ![]() We calculated the mean and the standard deviation (SD) in each group, and excluded subjects with values beyond twice the SD-line. This study was a part of the Kahoku Longitudinal Aging Study (KLAS) that aims to reveal the comprehensive functions in the aged. Normally, the BUN:serum creatinine ratio is about 15:1, with the BUN and serum creatinine increasing in the absence of GFR by 10 to 15 and 1.0 to 1.5 mg/dl/day. ![]() How this test is conducted: A blood sample is taken and sent for analysis. Normal range: 7 to 20 milligrams per deciliter (mg/dl). We measured the variables also in 315 cases of sex-matched young control subjects (male, 139 female, 176). Purpose: To detect elevated waste levels in the bloodstream, which is an early sign of reduced kidney function. 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.
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