![]() ![]() 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. ![]() For the adult male, the normal range is 0.6 to 1. Significant positive correlation was found between BUN levels and age in male elderly subjects. The normal serum creatinine ( s Cr) varies with the subjects body muscle mass and with the technique used to measure it. 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. In the above models, when BUNCR was >10.455 and > 16. 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. After adjustment for different confounders, the association between BUNCR and patient mortality remained significant in both adjusted model 1 and model 2 when BUNCR was 10.455 and 16.25 (OR < 1). 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. We measured the variables also in 315 cases of sex-matched young control subjects (male, 139 female, 176). For the adult male, the normal range is 0.6 to 1.2 mg/dl, or 53 to 106 mol/L by the kinetic or enzymatic method, and 0.8 to 1.5 mg/dl, or 70 to 133 mol/L by the older manual Jaff reaction. 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. The normal serum creatinine ( s Cr) varies with the subject's body muscle mass and with the technique used to measure it. ![]()
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