Patient Activity Scale (PAS) for RA

PAS for RA Calculator
0-10
0-10
0-3
PAS Score:
Quantifies severity of rheumatoid arthritis (RA) using patient-reported symptoms.

Why Use

Captures disease fluctuations and patient-reported symptoms that may not be evident through laboratory tests or physical examination. Offers a way to engage patients in their own care by focusing on their perceived function and well-being.

When to Use

Use in patients with rheumatoid arthritis (RA) to assess disease activity from their own perspective. Helpful during routine follow-ups to monitor treatment response or track disease progression over time.

Formula

PAS = (A × 3.33 + B + C) / 3, where A = Health Assessment Questionnaire Disability Index (HAQ-DI), calculated by averaging of the selected categorical scores* below. B = Pain Visual Analog Scale (ask patient to rate pain on a scale of 0-10, where 10 is worst pain imaginable). C = Patient Global Assessment of Disease Activity (ask patient to rate how well they are doing in the past week considering all the ways their disease affects them on a scale of 0-10, where 10 is the worst). *Categorical score is the highest selected score within a given category. Example: If patient can self-dress without any difficulty but shampoos hair with much difficulty, the categorical score for dress and groom is 2. Variable Points Is patient able to dress and groom Self-dress, including shoelaces and buttons Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Shampoo hair Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Is patient able to a rise Stand up from a straight chair Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Get in and out of bed Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Is patient able to e at Cut own meat Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Lift a full cup or glass to mouth Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Open a new milk carton Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Is patient able to w alk Walk outdoors on flat ground Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Climb up five steps Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Is patient able to p erform hygiene activities Wash and dry body Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Take a tub bath Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Get on and off toilet Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Is patient able to r each Reach and get down a 5-pound object (such as a bag of sugar) from above head Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Bend down to pick up clothing from floor Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Is patient able to g rip Open car doors Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Open previously opened jars Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Turn faucets on and off Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Is patient able to p erform other activities Run errands and shop Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Get in and out of car Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 Do chores such as vacuuming or yard work Without any difficulty 0 With some difficulty 1 With much difficulty 2 Unable 3 If patient uses any aids or devices and/or requires help from another person for any given category, the score for that category is adjusted upward to 2. If the categorical score is already ≥2, the score remains unchanged.

Pearls / Pitfalls

May overestimate disease activity in patients with comorbidities such as fibromyalgia, depression, or other chronic pain conditions. Combines the Health Assessment Questionnaire (HAQ), a visual analog scale (VAS) for pain, and a global severity scale.

Advice

Interpret results alongside clinical findings and laboratory data to guide treatment decisions. If scores remain elevated: Reassess the current RA treatment regimen and consider escalation if appropriate. Consider evaluating for noninflammatory causes of symptoms, such as fibromyalgia. Repeat the score regularly to track treatment effectiveness and disease control.

More Information

Interpretation: PAS Disease Activity 0.00-0.25 Remission 0.26-3.70 Low/minimal 3.71-7.99 Moderate 8.00-10.00 High/severe

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