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HERMAN O. MOSENTHAL 



protein nitrogen is high or low. This fact makes it feasible to differentiate 

 the cases with impaired renal function from normal individuals, when the 

 non-protein nitrogen is not raised. The data in Table 7 show how the per- 

 centage of urea nitrogen remains fairly constant regardless of the level of 

 the total non-protein nitrogen. 



TABLE 7 



DATA FROM A CASE OF CHRONIC NEPHRITIS WITH A CONSTANTLY HIGH PERCENTAGE OF 

 UREA N REGARDLESS OF WHETHER THE TOTAL NON-PROTEIN NITROGEN is HIGH OR 

 Low. (Mosenthal and Hiller.) 



Cases with acute renal conditions show a high percentage of the urea 

 nitrogen of the blood which returns to normal as convalescence occurs. 

 This is well illustrated in Table 8. 



TABLE 8 



DATA FROM A CASE OF ACUTE NEPHRITIS, DEMONSTRATING THE CHANGE FROM A HIGH 

 TO A NORMAL PERCENTAGE OF UREA NITROGEN DURING CONVALESCENCE. (Mosen- 

 thal and Hiller.) 



