The aim of this research was to evaluate the relevance of using deuterium oxide (HO) and bio-impedance analysis (BIA) to assess size and function of the interstitium for urological research. Nineteen volunteers were recruited to this prospective trial combining ingestion of HO and BIA. Blood samples were obtained every 10 min after ingestion of HO. Urine was collected before and after the experiment. BIA was performed every 5 min. Body position was alternated to study the effect on fluid distribution. First order kinetics were assumed for the uptake of HO from the gastrointestinal tract to the blood. Sex seemed to have an influence with a significantly slower exchange for women ( = 0.041, men: 0.052 min, women: 0.038 min). Impedance measured in legs (men: = 0.012, women: = 0.008) and trunk (both < 0.001) decreased significantly with posture change. These changes probably reflect the orthostatic redistribution of fluid with an increase of fluid in both trunk and legs. Both methods were tested and found to be useful for further urological research. Significant gender differences in HO uptake dynamics from the gastrointestinal pool were observed. An impact of posture changes on the electrical impedance measured was observed.
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