Abstract: A pulse oximetry sensor having an elongate flexible body, an emitter and a detector mounted adjacent the lower surface of the body in a spaced apart relation. First and second attachment members are mounted on the upper surface of the body and are aligned respectively with the emitter and detector. A disposable flexible member has an adhesive on one side and first and second couplers spaced apart a distance equal to that between the first and second attachment members. Each coupler is constructed and arranged to couple to one of the attachment members for coupling the body to the flexible disposable member in cooperation with the adhesive. The member is constructed and arranged to mount the body on a patient with the emitter and detector opposite one another.