172 ABNORMAL URINE. 



3. Search for blood corpuscles. 



4. Spectroscope. 



Mucin, Is increased in cystitis and may be derived from 

 the vagina. Tests : 



1. Dilute the urine, if the S.G. is high to prevent the salts 



keeping the mucin in solution, with 2 volumes of water 

 and add acetic acid pp. 



2. If there be a heavy deposit in the urine collect some of 



it with a pipette, place in a tube and add drops of 

 ISTaOH, the mucin will lose its viscidity and become fluid. 



Pus. Donne's test. Collect some of the deposit with a pipette 

 and add to it some NaOH solution. It thickens and the fluid 

 moves sluggishly in the tube on shaking, alkali albumin 

 being formed. 



Cystinuria. The crystals of cystin are found in urine in 

 rheumatism. It may occur as a constant constituent to the 

 extent of 0*5 g in 24 hours, but is usually abnormal. 



1. It is insoluble in water. 



2. The crystals are six-sided plates. 



21 Glycosuria, sugar in urine, saccharine urine. A very 

 small quantity may be normally present in urine. The 

 quantity is large in diabetes mellitus. The appearance of 

 more than a mere trace of a reducing substance is clinically 

 important. The presence of dextrose is indicated by the 

 usual tests. 



Tests. Remove proteids as they interfere. 



(ci) With Copper Salts. 



Trommer's test is the type. Make urine strongly alkaline with 

 KOH (or NaOH) add, with care, by drops solution 

 CuSO 4 (l p<c -). On heating a yellow or red pp of cuprous 



