Rheumatology

ASDAS-ESR calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Back pain (0-10)

0-10

Allowed range: 0–10 0-10

Duration of morning stiffness (0-10)

0-10

Allowed range: 0–10 0-10

Patient global (0-10)

0-10

Allowed range: 0–10 0-10

Peripheral pain/swelling (0-10)

0-10

Allowed range: 0–10 0-10

ESR (mm/h)

mm/h

Allowed range: 1–150 mm/h

Result

5 fields remaining

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Professional use only

For qualified clinicians. Independently verify inputs, calculations, source guidance, and applicability before any clinical action. This calculator does not replace clinical judgment.

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-ESR = 0.08 x back pain + 0.07 x duration of morning stiffness + 0.11 x patient global + 0.09 x peripheral pain/swelling (each 0-10) + 0.29 x sqrt(ESR mm/h). 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. ASAS prefers ASDAS-CRP; ASDAS-ESR is the alternative. (2009)

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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
ESR (mm/h)Accepted range: 1 to 150

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-ESR = 0.08 x back pain + 0.07 x duration of morning stiffness + 0.11 x patient global + 0.09 x peripheral pain/swelling (each 0-10) + 0.29 x sqrt(ESR mm/h). 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. ASAS prefers ASDAS-CRP; ASDAS-ESR is the alternative. (2009)

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