Parkinson's Disease: Hoehn & Yahr Classification Scale

Question 1

Stage 1 (I)

Answer 1

Minimal or no functional impairment, unilateral involvement only

Unilateral features of: tremor, rigidity, bradykinesia

Question 2

Stage 2 (II)

Answer 2

Bilateral involvement; balance not impaired

Bilateral Involvements of: tremor, rigidity or bradykinesia.

(Should not have a history of falls yet)

Question 3

Stage 3 (III)

Answer 3

Mild to moderate disability, loss of righting reflexes

Question 4

Stage 4 (IV)

Answer 4

Moderate to severe disability, balance and stability impairments

(Standing and walking possible only with assistance.)

Question 5

Stage 5 (V)

Answer 5

Severe disability, confined to bed or wheelchair