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Clinical Chemistry 41: 1522-1525, 1995;
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Clinical Chemistry, Vol 41, 1522-1525, Copyright © 1995 by American Association for Clinical Chemistry

Composition of interstitial fluid

N Fogh-Andersen, BM Altura, BT Altura and O Siggaard-Andersen
Department of Clinical Chemistry, Herlev Hospital, Denmark.

In several previous experiments to determine the composition of interstitial fluid, the results varied depending on the collecting technique, and the electrolyte concentrations differed from those of a hypothetical ultrafiltrate of plasma. In our approach, since a change of position from standing to supine is accompanied by hemodilution with interstitial fluid, we used the changes in hematocrit and composition of plasma in 20 subjects before and after lying down to calculate the composition of added interstitial fluid. The estimated protein concentration was 20.6 g/L, and the concentrations of total calcium and magnesium were low, in accord with a lower concentration of protein- bound calcium and magnesium. The activity of free cations was also lower, in agreement with a Donnan equilibrium potential of 1 mV across the endothelium. The concentration of leukocytes and platelets decreased according to the hemodilution, implying no escape or mobilization of these elements.


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