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1 Blood Research Laboratory of Pratt Diagnostic Clinic-New England Center
Hospital and the Department of Medicine, Tufts University School at Medicine, Boston,
Mass.
1. Red cell volume and plasma volume were measured by the radioactive
sodium chromate and the chromic chloride method respectively in 37 patients. 2. The body hematocrit/venous hematocrit (BH/VH) ratio was found to
be constant in normal subjects and in patients in whom there was neither
splenomegaly nor edema. The ratio was 0.896 ± 0.039. 3. In splenectomized patients the BH/VH ratio was normal indicating that
in man, in normal conditions, the spleen does not have the function of a
significant blood reservoir with raised cell/plasma ratio. 4. In patients with splenomegaly the BH/VH ratio was found to be significantly increased in direct proportion to the degree of splenic enlargement,
indicating an increased concentration of erythrocytes in the enlarged spleen. 5. In the presence of extravascular fluid retention caused by prolonged
prednisone treatment the BH/VH ratio was lower than normal. 6. It was concluded that in patients with splenomegaly or edema
measurement of either red cell volume or plasma volume alone in conjunction
with the "corrected" venous hematocrit does not permit valid assessment of
the non-measured parameter nor of the total blood volume.
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