Skip to Content



Definition: This measurement is the ratio of the pulsatile blood flow (often graphically displayed by a plethysmograph) to the nonpulsatile blood flow in a patient's peripheral tissue, usually the patient's finger. This index correlates with capillary refill time and thus is an indicator of tissue blood perfusion.

Disclaimer: This site is designed to offer information for general educational purposes only. The health information furnished on this site and the interactive responses are not intended to be professional advice and are not intended to replace personal consultation with a qualified physician, pharmacist, or other healthcare professional. You must always seek the advice of a professional for questions related to a disease, disease symptoms, and appropriate therapeutic treatments.
© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.