2017 EULAR/ACR Myositis Classification
2017 EULAR/ACR classification criteria for idiopathic inflammatory myopathies (Lundberg 2017), without-biopsy weights.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Age of onset
- >= 40 years (2.1)
- Proximal upper-extremity weakness
- Yes
- Proximal lower-extremity weakness
- No
- Neck flexors weaker than extensors
- No
- Leg proximal weaker than distal
- No
- Heliotrope rash
- Yes
- Gottron's papules
- No
- Gottron's sign
- No
- Dysphagia / esophageal dysmotility
- No
- Anti-Jo-1 antibody
- Yes
- Elevated CK / LDH / AST / ALT
- No
Result: 2017 EULAR/ACR myositis score 9.8 — definite inflammatory myopathy (>= 7.5, ~90% probability).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- < 5.3
- Below the classification threshold.
- 5.3-7.4
- Possible / probable inflammatory myopathy.
- >= 7.5
- Definite (~90% probability). Without-biopsy weights. A classification, not a treatment order.
What you enter
- Age of onset (points)
- Proximal upper-extremity weakness (0.7)
- Proximal lower-extremity weakness (0.8)
- Neck flexors weaker than extensors (1.9)
- Leg proximal weaker than distal (0.9)
- Heliotrope rash (3.1)
- Gottron's papules (2.1)
- Gottron's sign (3.3)
- Dysphagia / esophageal dysmotility (0.7)
- Anti-Jo-1 antibody (3.9)
- Elevated CK / LDH / AST / ALT (1.3)
How this is calculated
Lundberg IE, Tjarnlund A, Bottai M, et al. 2017 EULAR/ACR classification criteria for adult and juvenile idiopathic inflammatory myopathies and their major subgroups. Arthritis Rheumatol. 2017;69(12):2271-2282. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.