URINALYSIS. 135 



The following solution should be made by the phy- 

 sician: hypobromite solution and Haines' solution. 



The others can be purchased at a drug store. The 

 first is prepared as follows : 25 c.c. of water to 100 

 grams of sodium hydrate ; the bromine and sodium hy- 

 drate must be kept "in separate vessels. When ready 

 to make the test, take 10 c.c. of the soda solution and 

 i c.c. of the bromine, add equal amount of water, mix, 

 then put the whole into the ureometer, then add the 

 urine. 

 Technic. 



1. Put the solution in the ureometer, filling the arm 

 and one-half of the bulb. 



2. Add i c.c. of urine to the solution ; use a pipette. 



3. Read the amount of urea in the specimen by 

 means of the graduate on the arm of the instrument. 

 This reading represents the amount in 24 hours in a 

 liter of urine. The normal amount ranges from 20 to 

 33 grams. The urea is decreased or increased in many 

 pathological conditions of the system. (For details 

 on the subject, see Practice, and for source of urea, see 

 Physiology; for composition and for reaction between 

 the solution and the urea, see Medical Chemistry.) 



In urinalysis all vessels must be clean. For chem- 

 ical analysis, the specimen must be that of the urine 

 representing the 24 hours urine, if not the whole. 



