#$%^&*AU2020200587A120200213.pdf#####ABSTRACT A blood volume monitor 10 includes a carrier 12 mountable about a part of a body of a subject. A measuring arrangement 13 is mounted on the carrier 12. The measuring arrangement 13 comprises at least one element 14, 18 configured to provide volume data relating to a volume of the part of the body of the subject underlying the carrier 12 and for measuring change in volume of the part of the body of the subject underlying the carrier 12 and for outputting response signals representative of the change in volume. A control unit 20 is in communication with the measuring arrangement 13 to process data output by the measuring arrangement 13 to determine, using the volume data, the volume of the part of the body of the subject underlying the carrier 12 and to determine blood volume in the part of the body of the subject, the control unit 20 using the response signals received from the measuring arrangement and the determined volume of the part of the body to determine the blood volume.
