HAQ-DI Calculator
Health Assessment Questionnaire Disability Index - Measure functional disability in arthritis
Functional Assessment
For each category, select the highest difficulty level experienced in any activity:
Dressing & Grooming
Arising
Eating
Walking
Hygiene
Reach
Grip
Activities
Results
Disability Scale
Clinical Significance
- • Change ≥ 0.22 = clinically meaningful
- • Higher scores indicate greater disability
- • Predicts work disability and mortality
- • Tracks disease impact over time
Scoring Method
HAQ-DI = Sum of highest score in each category ÷ 8 categories
Each category uses the highest difficulty rating from its questions
💡 Clinical Note
If assistive devices or help from others is needed, score may be adjusted upward to reflect true disability level.
Understanding HAQ-DI Score
The Health Assessment Questionnaire Disability Index (HAQ-DI) is one of the most widely used patient-reported outcome measures in rheumatology. It assesses functional disability across 8 categories of daily activities, providing a comprehensive view of how arthritis affects a patient's quality of life.
Eight Functional Categories
- Dressing & Grooming: Self-care activities including buttons, shoelaces, hair care
- Arising: Getting up from chairs and in/out of bed
- Eating: Cutting food, drinking, opening containers
- Walking: Outdoor mobility and climbing stairs
- Hygiene: Bathing, toileting, and personal care
- Reach: Overhead reaching and bending down
- Grip: Opening doors, jars, and turning faucets
- Activities: Shopping, errands, housework, and car use
Scoring System
Each activity is rated on a 4-point scale:
- 0: Without ANY difficulty
- 1: With SOME difficulty
- 2: With MUCH difficulty
- 3: UNABLE to do
For each category, the highest score from any activity within that category is used. The HAQ-DI is calculated by averaging the 8 category scores, resulting in a final score from 0 (no disability) to 3 (severe disability).
Clinical Application
- Treatment Response: Change ≥ 0.22 points is considered clinically meaningful
- Disease Monitoring: Tracks functional impact of arthritis over time
- Treatment Decisions: Guides decisions about therapy intensification or rehabilitation needs
- Prognosis: Predicts long-term outcomes including work disability, surgery need, and mortality
- Quality of Life: Correlates strongly with patient-reported quality of life
Interpretation Guidelines
- 0: No functional impairment
- 0.1 - 1.0: Mild to moderate disability - may benefit from ergonomic modifications
- 1.1 - 2.0: Moderate to severe disability - likely needs assistive devices
- 2.1 - 3.0: Severe to very severe disability - may require extensive assistance
Assistive Device Adjustment
The standard HAQ-DI includes an adjustment for use of assistive devices or help from another person. If a patient uses aids or needs help for activities they score as 0 or 1, the score for that category may be increased to at least 2 to reflect the true level of disability. This adjustment ensures the score captures the full extent of functional limitation.
HAQ-DI Categories and Sample Questions
| Category | Sample Activities | Common Challenges |
|---|---|---|
| Dressing | Buttons, shoelaces, shampooing | Hand/wrist arthritis, shoulder limitations |
| Arising | Standing from chair, bed transfers | Hip, knee, lower extremity weakness |
| Eating | Cutting meat, lifting cup, opening cartons | Hand grip, wrist, elbow limitations |
| Walking | Flat ground, stairs | Hip/knee arthritis, foot problems |
| Hygiene | Bathing, toileting | Overall mobility, balance issues |
| Reach | Overhead reach, bending down | Shoulder, spine, hip limitations |
| Grip | Opening doors, jars, faucets | Hand/wrist arthritis, grip weakness |
| Activities | Shopping, car use, housework | Overall functional capacity |
Frequently Asked Questions
What is a clinically meaningful change in HAQ-DI?
A change of 0.22 points or greater is considered the minimum clinically important difference (MCID) for HAQ-DI. This means that improvements or deteriorations of this magnitude represent a meaningful change in functional ability from the patient's perspective. Larger changes (≥0.5) indicate substantial improvement or worsening.
How does HAQ-DI differ from HAQ-II?
HAQ-II is a simplified version with only 10 questions (compared to 20 in HAQ-DI) and doesn't include the assistive device/help adjustments. While HAQ-II is quicker to administer, HAQ-DI remains the gold standard for comprehensive functional assessment and is more widely used in research and clinical practice.
Can HAQ-DI be used for conditions other than rheumatoid arthritis?
Yes, while initially developed for RA, HAQ-DI is validated for use in many rheumatic conditions including osteoarthritis, lupus, ankylosing spondylitis, psoriatic arthritis, and other inflammatory arthritides. It's also used in some non-rheumatic conditions affecting physical function. The activities assessed are relevant across various conditions that affect mobility and daily function.
How often should HAQ-DI be assessed?
Assessment frequency depends on the clinical context. During treatment changes or active disease, monthly or quarterly assessment is appropriate. For stable patients, every 6-12 months is typically sufficient. More frequent monitoring helps track treatment effectiveness and identify functional decline early, allowing for timely interventions.
What if a patient scores differently in questions within the same category?
This is expected and normal. Within each category, you should use the highest (worst) score from any of the component questions. For example, in the Eating category, if cutting meat is scored as 2 (much difficulty) but lifting a cup is scored as 1 (some difficulty), the category score would be 2. This approach ensures the score reflects the true level of limitation.
Does HAQ-DI predict long-term outcomes?
Yes, HAQ-DI has strong prognostic value. Higher baseline HAQ-DI scores predict increased risk of work disability, need for joint replacement surgery, hospitalization, and even mortality. Studies show that each 1-point increase in HAQ-DI approximately doubles mortality risk. This makes HAQ-DI valuable not just for monitoring current status but also for identifying patients who may need more aggressive treatment or closer follow-up.
How should assistive devices and help from others be considered?
In the standard HAQ-DI, if a patient uses assistive devices (cane, walker, jar opener, raised toilet seat, etc.) or needs help from another person for activities scored as 0 or 1, the score for that category should be adjusted to at least 2. This reflects that although the task can be completed, it requires assistance, indicating true functional limitation. However, some versions of HAQ-DI report the basic score without this adjustment - ensure consistency in your practice.
Is HAQ-DI useful in clinical trials?
Absolutely. HAQ-DI is one of the core outcome measures in rheumatology clinical trials and is part of the ACR response criteria. It captures the patient's perspective on functional ability, which is crucial for assessing treatment benefit beyond laboratory values or physician assessments. Regulatory agencies recognize HAQ-DI as a validated patient-reported outcome for drug approval studies.