Patent ID: 9730590
Date: 2017-08-15
CPC Classifications: A61B

Claim:
1. A method of assessing a subject by producing a subject-dependent indicator that measures a response of a subject's blood circulation system to postural change, comprising: providing a signal for a first posture dependent upon a blood volume in a limb of the subject when the subject is in a first posture by measuring a parameter indicative of the blood volume of the subject's limb when the subject is in the first posture prior to a postural change; providing a signal for a second posture dependent upon a blood volume in a limb of a subject after a change in subject posture from the first posture to a second posture, different to the first posture by measuring the parameter when the subject is in a second posture after the postural change; isolating at least a pulsating component of the measured parameter; and using a processor to calculate a quantitative subject-dependent indicator that measures a response of the subject's blood circulation system to the postural change and is dependent upon at least the pulsating component of the measured parameter for the first posture and the pulsating component of the measured parameter for the second posture.