Neurology

Modified Hoehn and Yahr Scale calculator

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

Clinical inputs

Mobility

Stage 4 and stage 5 follow disability and outrank laterality and the pull test.

Distribution of signs

Balance

Recovery on the pull test gives stage 2.5 only when signs are bilateral. Unilateral disease with postural instability is stage 3.

Result

3 fields remaining

Anyone can run this calculator. Sign in to save, favourite, or send the result.

Primary source

Goetz CG et al. Movement Disorder Society Task Force report on the Hoehn and Yahr staging scale: status and recommendations. Mov Disord. DOI: 10.1002/mds.20213. PMID: 15372591. Table 1 prints the modified stages: 1.0 unilateral involvement only; 1.5 unilateral and axial involvement; 2.0 bilateral involvement without impairment of balance; 2.5 mild bilateral disease with recovery on the pull test; 3.0 mild to moderate bilateral disease with some postural instability, physically independent; 4.0 severe disability, still able to walk or stand unassisted; 5.0 wheelchair bound or bedridden unless aided. Highly disabling unilateral disease stays at stage 1. Unilateral disease with postural instability is stage 3. Stage 4 is severe disability with bilateral disease. Stage 2.5 is only mild bilateral disease with recovery on the pull test. (2004)

Scope: Parkinson's disease, staged from the examination as it is seen, including comorbidity. Recovery on the pull test changes the stage when signs are bilateral. It does not create a 2.5 when signs are only unilateral.

Last reviewed 2026-10-17

View source

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: Goetz CG et al. Movement Disorder Society Task Force report on the Hoehn and Yahr staging scale: status and recommendations. Mov Disord. DOI: 10.1002/mds.20213. PMID: 15372591. Table 1 prints the modified stages: 1.0 unilateral involvement only; 1.5 unilateral and axial involvement; 2.0 bilateral involvement without impairment of balance; 2.5 mild bilateral disease with recovery on the pull test; 3.0 mild to moderate bilateral disease with some postural instability, physically independent; 4.0 severe disability, still able to walk or stand unassisted; 5.0 wheelchair bound or bedridden unless aided. Highly disabling unilateral disease stays at stage 1. Unilateral disease with postural instability is stage 3. Stage 4 is severe disability with bilateral disease. Stage 2.5 is only mild bilateral disease with recovery on the pull test. (2004)

Ruqelo is AI and can make mistakes. Check important information.

Clinical inputs

Mobility
Distribution of signs
Balance

Primary source

View source