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Relatively undisturbed samples of human oviduct fluid were obtained by aspiration into a Silastic catheter inserted through the fimbriated end of the oviduct during surgical laparotomy. The concentrations of Na, Cl, K, Ca, Mg, S and P were determined in picolitre aliquots of this fluid using X-ray spectrometry by electron probe excitation. Human tubal fluid has a unique elemental composition characterized by high concentrations of K and Cl, but low concentrations of Ca, relative to the range of normal human serum values. Na and Mg concentrations in oviduct fluid are similar to serum levels.

Elemental composition of fluid in the human Fallopian tube