The Duke Activity Status Index is a self-administered questionnaire that measures a patient's functional capacity. It can be used to get a rough estimate of a patient's peak oxygen uptake.


The instrument consists of 12 questions.


The responses are yes or no. Each "yes: response is assigned a weighted point score (from 1.75 to 8.00)


Duke activity status index =

= SUM(values for all 12 questions)



• maximum value 58.2

• minimum value 0


estimated peak oxygen uptake in mL/min =

= (0.43 * (duke activity status index)) + 9.6


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