Duke Activity Status Index (DASI)
Calculate the Duke Activity Status Index (DASI) score using the 12-item functional capacity questionnaire. Estimate VO₂ max and METs for cardiovascular assessment.
DASI Questionnaire
Check each activity the patient is currently able to perform. Each activity has a weighted metabolic score.
About This Calculator
About the Duke Activity Status Index (DASI)
The Duke Activity Status Index (DASI) is a validated 12-item self-administered questionnaire developed by Hlatky and colleagues in 1989 to assess functional capacity in patients with cardiovascular disease. It estimates a patient's peak oxygen uptake (VO₂ max) based on their ability to perform common daily activities ranging from basic self-care to strenuous sports.
The DASI is widely used by cardiologists, cardiac surgeons, and anesthesiologists for preoperative risk assessment, evaluating response to treatment, and guiding cardiac rehabilitation. Each of the 12 activities carries a specific metabolic weight derived from the metabolic equivalent of task (MET) values. The total DASI score ranges from 0 to 58.2, with higher scores reflecting better functional capacity.
Methodology
The DASI score is calculated by summing the weighted points of all activities the patient can perform. From the total DASI score, the estimated VO₂ max is derived using the formula: VO₂ max (mL/kg/min) = 0.43 × DASI score + 9.6. Metabolic equivalents (METs) are then calculated as VO₂ max divided by 3.5. Research by Wijeysundera et al. demonstrated that a DASI score of 34 or less is associated with increased risk of postoperative myocardial injury, myocardial infarction, and moderate-to-severe complications in surgical patients.
Regional Notes
The DASI is used internationally across healthcare systems in India, the United States, and the United Kingdom. It was originally validated in the US population but has demonstrated reliability across diverse populations. In India, it is increasingly used in preoperative assessment clinics. In the US, it is incorporated into perioperative risk stratification guidelines. In the UK, it is used by the National Health Service (NHS) as part of preoperative functional capacity assessment. No region-specific adjustments are needed as the questionnaire items describe universal daily activities.
Frequently Asked Questions
What is the Duke Activity Status Index (DASI)?
The Duke Activity Status Index (DASI) is a 12-item self-administered questionnaire developed by Hlatky et al. in 1989 to assess functional capacity in patients with cardiovascular disease. It asks about daily activities such as personal care, household tasks, and recreation, assigning metabolic weights to each activity to estimate peak oxygen uptake (VO₂ max).
How is the DASI score calculated?
The DASI score is calculated by summing the weighted metabolic scores of all activities the patient reports being able to perform. Each of the 12 activities has a specific weight in points (ranging from 1.75 to 8.0). The total score ranges from 0 to 58.2, with higher scores indicating better functional capacity. The VO₂ max is then estimated as 0.43 × DASI + 9.6, and METs are calculated as VO₂ max / 3.5.
What does a low DASI score indicate?
A DASI score of 34 or less indicates reduced functional capacity. Research by Wijeysundera et al. found that patients with DASI scores of 34 or below are at increased risk of postoperative myocardial injury, myocardial infarction, moderate-to-severe complications, and new disability after surgery. A low score should prompt further clinical evaluation.
Is the DASI calculator suitable for all regions including India, the US, and the UK?
Yes, the DASI calculator is a validated clinical tool used worldwide including in India, the United States, and the United Kingdom. It was originally developed in the US and has been validated in multiple international populations. The questionnaire items are activity-based and do not reference any country-specific norms, making it universally applicable across all healthcare settings.
Can the DASI replace a formal exercise stress test?
No, the DASI is a subjective self-report questionnaire that estimates functional capacity and should not replace objective cardiopulmonary exercise testing (CPET) or formal stress testing. It provides a quick, low-cost estimate of a patient's functional status and is often used as a screening tool. Always confirm findings with objective testing when making clinical decisions.
How accurate is the DASI for estimating VO₂ max?
The DASI provides a reasonable estimate of VO₂ max using the formula VO₂ max = 0.43 × DASI + 9.6, as validated by Hlatky et al. against treadmill exercise testing. The correlation with measured peak oxygen uptake is moderate to strong. However, individual accuracy may vary and results should be interpreted by a healthcare professional in the context of the patient's overall clinical picture.
Who should use the DASI calculator?
The DASI calculator is used by cardiologists, cardiac surgeons, anesthesiologists, and other healthcare professionals to assess functional capacity in patients with cardiovascular disease, those being evaluated for surgery, or patients undergoing cardiac rehabilitation. It can also be used by patients for educational purposes, but results should always be reviewed with a healthcare provider.
What are the limitations of the DASI?
The DASI relies on patient self-report, which may overestimate or underestimate true functional capacity. It does not account for musculoskeletal limitations, cognitive impairment, or other comorbidities that may affect activity performance. The questionnaire was originally validated in patients with cardiovascular disease and may not be as accurate in other populations. It is a screening tool, not a diagnostic instrument.