Assessing Functional Status

Core Functional Capacity Questions

The American College of Cardiology recommends asking patients if they can walk 4 blocks or climb 2 flights of stairs without stopping to identify those with poor functional capacity (<4 METs) who are at increased risk for cardiovascular events and mortality 1, 2
Patients who cannot perform these activities are at increased risk for perioperative myocardial ischemia, cardiovascular events, and serious complications (P<0.006 for blocks walked; P<0.01 for stairs climbed) 1
The American Heart Association suggests that activities requiring <4 METs, such as slow ballroom dancing, playing a musical instrument while seated, walking at 2-3 mph on flat ground, and golfing using a cart, indicate poor functional capacity 1, 3, 4, 5
Activities requiring ≥4 METs, such as moderate cycling, climbing hills, playing singles tennis, jogging, and ice skating or rollerblading, indicate adequate functional capacity 1, 2, 3, 5

The American College of Cardiology/American Heart Association guidelines recommend using the Duke Activity Status Index for systematic functional capacity estimation, which provides a standardized set of questions that correlate with MET levels 1, 3, 4

For cardiovascular patients, the American College of Cardiology recommends asking about dyspnea, exercise tolerance, and volume status to assess heart failure functional status 6, 7
For stroke patients, the American Stroke Association suggests asking three essential questions to identify rehabilitation gaps and unmet needs: "What could you do before the stroke that you cannot do now?", "What do you want to be able to do?", and "Have you reached your full potential for recovery?" 8

The American Thoracic Society notes that objective measurements, such as the Six-Minute Walk Test, are superior to self-reports alone for assessing functional capacity 5, 9

The American College of Cardiology recommends a step-by-step approach to assessing functional status, including asking about 4-block/2-stair capacity, assessing for cardiac risk factors and rehabilitation potential, and documenting specific activity level using the Duke Activity Status Index or similar tool 1, 3, 4

Patients describe functional limitations through cardiovascular and respiratory symptoms, including dyspnea patterns, paroxysmal nocturnal dyspnea, fatigue, and volume-related symptoms, such as weight changes and swelling in extremities or abdomen, as reported in the American Heart Association guidelines 10

Patients quantify functional status through specific physical activities, such as activity-specific limitations, which detail the degree of exertion required to elicit symptoms, as recommended by the American College of Cardiology 10

Patients describe limitations in fundamental self-care tasks, including mobility, such as walking and moving within the home environment, which is essential for home independence, as stated by the American Thoracic Society 10, 11
Patients report capacity for complex community-based tasks, including domestic tasks, such as cooking, cleaning, laundry, and household management, as well as frequency and difficulty of performing these tasks, as described in the American Journal of Respiratory and Critical Care Medicine 11

Heart failure patients describe specific activity levels that trigger dyspnea, changes in symptoms since last visit, and urinary continence status, which are crucial for monitoring disease progression, as recommended by the American Heart Association 10
Pulmonary disease patients describe problematic daily activities from predefined lists, such as the Manchester Respiratory Activities of Daily Living Scale, and walking may not be an important goal for up to one-third of individuals, highlighting variability in patient priorities, as stated by the American Thoracic Society 11

Exercise capacity measured by field tests, such as the 6-minute walk, does not correlate strongly with self-reported physical activity levels or problematic daily activities, requiring both types of assessment, as recommended by the American Thoracic Society 11