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ADVENTURES IX RADIOISOTOPE RESEARCH 



volume calculated from the plasma volume and the hematocrit reading 

 and they interpreted their result as an indication of their suggestion. 

 Furthermore, Hooper, Smith and Whipple (1920) have shown that, after 

 having lowered the hematocrit reading by haemorrhage, the measured 

 red corpuscle volume (from the plasma volume and the hematocrit 

 reading) did not agree with the red corpuscle volume predicted on the 

 basis of the volume of the erythrocytes removed. If the red corpuscle 

 volume before bleeding is equal to the red corpuscle volume after haemor- 



Table 5. — Corpuscle Content of Hximan Subjects Determined by Making 



Use of ^sp as an Indicator 



Mean value** 



• No. 1 was a patient suffering from polycytemia. The corpuscle content of this patient is not included 

 in the average. 



** Mostly lean subjects were investigated. 



rhage, plus the volume of erythrocytes removed, the hematocrit reading 

 gives the correct corpuscle— plasma ratio of the whole blood; if the 

 corpuscle volume before haemorrhage is greater than the corpuscle 

 volume after bleeding, plus the volume of red corpuscles removed, the 

 hematocrit reading does not represent the corpuscle — plasma ratio of 

 the blood of the whole body. 



