Rheumatology
ASDAS-CRP calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Allowed range: 0–10 0-10
Allowed range: 0–10 0-10
Allowed range: 0–10 0-10
Allowed range: 0–10 0-10
Allowed range: 0–20 mg/dL
Result
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Clinical inputs
- Back pain (0-10)Accepted range: 0 to 10
- Duration of morning stiffness (0-10)Accepted range: 0 to 10
- Patient global (0-10)Accepted range: 0 to 10
- Peripheral pain/swelling (0-10)Accepted range: 0 to 10
- CRP (mg/L; values below 2 mg/L are scored as 2)Accepted range: 0 to 200
Primary source
Lukas C et al. Development of an ASAS-endorsed disease activity score (ASDAS) in patients with ankylosing spondylitis. Ann Rheum Dis 2009;68:18-24. DOI: 10.1136/ard.2008.094870. PMID: 18625618. ASDAS-CRP = 0.12 x back pain + 0.06 x duration of morning stiffness + 0.11 x patient global + 0.07 x peripheral pain/swelling (each 0-10) + 0.58 x ln(CRP mg/L + 1). Disease activity states (Machado P et al. Ann Rheum Dis 2011;70:47-53; 2018 ASAS nomenclature update renamed 'moderate' to 'low'): inactive <1.3; low 1.3 to <2.1; high 2.1 to 3.5; very high >3.5. CRP below 2 mg/L or below the detection limit is replaced by the constant 2 mg/L (Machado P et al. Arthritis Rheumatol 2015, DOI 10.1002/art.38921; ASAS calculator). (2009)
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