While the majority of clinicians have admitted the existence of renal glycosuria, the number of entirely acceptable cases that have been reported is small. Allen1 accepts only two, those of Bönninger2 and Tachau,3 and Foster4 found no others above suspicion. Recently, several cases have been reported, some of which present the characteristics of mild diabetes mellitus. With the introduction of simple, accurate methods for determining the sugar content of the blood, it has been possible to establish the diagnosis on a firm basis.
The subject has been discussed in detail by several modern authors, notably Goto,5 Bailey6 and Lewis and Mosenthal.7 It is important to remember that extreme caution should be used in making the diagnosis of renal glycosuria, rather than that of diabetes mellitus; the disastrous injustice of assuring a diabetic that he has the innocuous disease that the former seems to be, and of failing to regulate his