Abstract
Conclusions
(1) Contrary to previous reports in the literature para-aminohippuric acid (PAH) has been found to “enter” the human erythrocyte at low and high plasma PAH concentrations. (2) It is pointed out that PAH plasma extraction will be falsely low and renal plasma flow estimation from the extraction values will be falsely high unless renal venous plasma is separated as soon as is possible after the blood leaves the kidneys. An alternate procedure is to determine the whole blood extraction and estimate the plasma extraction with the aid of the hematocrit.
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