Red cells labeled with radioactive phosphorus have been used by us to measure the extent and the rate of the replacement of blood in exchange transfusions. The experimental results confirmed the theoretic formulations developed in the preceding paper. On the basis of the above data, it seems reasonable to introduce these curves and formulae whenever exchange transfusions are to be performed.

ACKNOWLEDGMENTS We are indebted to Miss G. Ohno and Miss S. Rezek for technical assistance rendered during this study.

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