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Blood-volumes measured by Evans blue in 41 normal subjects are compared with those
predicted for the same subjects from various formulae. The difference exceeds 500
ml. in 41 per cent of cases and 700 ml. in 20 per cent. Examples are quoted to show
how even larger errors may arise in certain clinical situations. Attention is drawn
to the fact that normal values predicted from certain formulae require correction
if used with semi-automatic instruments which compute the blood-volume from the dilution
of radioisotopes in whole blood without allowing for the body haematocrit/venous haematocrit ratio.
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References
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© 1970 Published by Elsevier Inc.
