Among 2183 patients (mean age 77.6 years) in the Korean Society of Geriatric Nephrology Retrospective Cohort, 1382 patients (63.3%) died during follow-up.

Normal Lab Values: Men: .7-1.3, Women: .6-1.1 mg/dl. The ratio of BUN to creatinine should be between 10:1 and 20:1. This test is a blood test that looks at how much creatinine is in the bloodstream.

In patients with antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV), high levels of baseline blood urea nitrogen (BUN) are a risk factor for end-stage kidney disease (ESKD) and/or ...