Eighteen of 38 captive okapi housed in the United States were found glucosuric by dipstick analysis. To confirm these findings, urine glucose concentrations of captive okapi from one collection (n = 10) were analyzed by two methods: urine dipstick analysis and quantitative analysis. Seven of these urine samples were positive for glucose by dipstick, with comparable glucose measurements by quantitative analysis. For a presumed normal control, okapi (n = 10) held in captivity within their native home range were tested for glucosuria by urine dipsticks; all were negative. Serum fructosamine (221–362 μmol/L) and insulin (9–45 pmol/L, 1.17–5.85 μU/ml) concentrations were determined from okapi (n = 6) with and without glucosuria with the use of results considered within normal limits for other ruminants. We conclude that glucosuria is a true finding in many apparently healthy captive okapi in the United States.
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