A variety of reducing substances is demonstrable under varying conditions in the human urine. In view of the danger of hypoglycemic shock as a result of nonindicated doses of insulin, it becomes a matter of more than theoretical importance to determine the nature of the substance present in the urine of a patient suspected of having diabetes. It need hardly be emphasized that a reduction of copper solutions is not sufficient for a diagnosis of diabetes. Even a blood sugar higher than normal, as in the case to be presented, may lead one astray. A frequent source of error is the presence of fructose in the urine. Occasionally, as in the present case, one is dealing with pentosuria.
While essential pentosuria is probably of more frequent occurrence than is generally recognized, the reported cases are not numerous, and the following case is that of the youngest patient on record. Pentose
LEVY DJ, PIERSON M. PENTOSURIA: REPORT OF A CASE. Am J Dis Child. 1927;33(2):213–217. doi:10.1001/archpedi.1927.04130140033004
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