Abstract: A complete bedpan system in which a mattress is apertured to accept a bedpan assembly, the bedpan being provided with a disposable liner to fully cover the surfaces engaged during usage and with the mouth of the liner being trapped between interengaging lips on the bedpan and on the mattress, hand-pocket recesses being provided to facilitate that trapping, with a sheet having a central aperture and a cuff to line and protect the aperture in the mattress, the cuff being trapped between the mattress and the bedpan, with a mattress plug to resiliently cover the bedpan when not in use, and provided with a rigid supporting base designed to center the plug with respect to the aperture in the mattress, and with an anti-contamination supporting plate underlying the mattress and the bedpan and serving to control the position of the bedpan relative to the springs and hence to control the position of the mattress relative to the springs.