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This communication describes a simple technique for obtaining sufficient quantities of pure endometrial fluid (uterine cavitary fluid) for microchemical analysis. We believe this technique has several advantages over other methods of sampling uterine fluid. Various constituents of endometrial fluid have been measured in flushings of the uterine cavity obtained through the endocervical canal. These measurements are valuable in a qualitative way, but are not indicative of actual cavitary concentrations because the volume of such fluid obtained by flushing is not known. Since endometrial fluid volume may vary from time to time in the same