DASI Calculator
Calculate DASI score, estimated VO2 peak, and METs from 12 daily activity questions for cardiovascular functional capacity.
What Is the Duke Activity Status Index?
The Duke Activity Status Index (DASI) estimates functional capacity from twelve yes-or-no questions about daily activities. Each activity carries a metabolic equivalent (MET) weight. The total score converts to estimated peak oxygen uptake (VO₂) and METs, which clinicians use for cardiovascular risk stratification before surgery. For related cardiac risk tools, see the Heart Disease Risk Calculator.
How the Score Is Calculated
Add the MET weights for every activity the patient can perform without chest pain, significant dyspnea, or undue fatigue. Estimated VO₂ peak equals 0.43 times the DASI score plus 9.6 mL/kg/min. METs equal VO₂ divided by 3.5. A DASI score of 34 or below flags elevated perioperative cardiovascular risk in validation studies.
Clinical Use
DASI is a self-report measure suitable for office visits and preoperative clinics. It does not replace exercise testing when high-risk surgery is planned, but it helps identify patients who may need further cardiopulmonary evaluation.
Frequently Asked Questions
What is the maximum possible DASI score?
If all twelve activities are marked yes, the total MET sum is 58.2 points. Most patients score well below this maximum.
Why is a score of 34 or below flagged?
Scores at or below 34 correlate with reduced functional capacity and higher perioperative cardiovascular complications in published cohorts.
How are METs derived from DASI?
First estimate VO₂ peak with 0.43 times DASI plus 9.6, then divide by 3.5 to express the result in METs.
Can patients with limited mobility still use DASI?
Yes. Answer each item based on current ability. Unchecked activities contribute zero points, which lowers the total score appropriately.
Does DASI replace a stress test?
No. DASI estimates capacity from self-reported activity. Formal exercise or pharmacologic stress testing may still be required for high-risk procedures.
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