What is the Kurtzke scale EDSS

EDSS (Expanded Disability Status Scale)

0.0

Normal neurological examination (Grade 0 in all functional systems (FS))

1.0

No disability, minimal abnormality in a FS (i.e. Grade I)

1.5

No disability, minimal abnormality in more than one FS (more than once grade I)

2.0

Minimal disability in one FS (one FS grade 2, others 0 or 1)

2.5

Minimal disability in two FS (two FS grade 2, others 0 or l)

3.0

Moderate disability in one FS (one FS grade 3, others 0 or 1) or slight disability in three or four FS (3 or 4 FS grade 2, others 0 or 1), but fully ambulatory.

3.5

Fully ambulatory but with moderate disability in one FS (grade 3) and one or two FS grade 2; or two FS grade 3; or five FS grade 2 (others 0 or 1) grade 2; or two FS grade 3; or five FS grade 2 (others 0 or l)

4.0

Can walk without help and rest for at least 500 m. Active for approx. 12 hours per day despite a relatively severe disability (one FS grade 4, others 0 or 1)

4.5

Can walk without help and rest for at least 300 m. Certain activity restriction, needs minimal help, relatively severe disability (one FS grade 4, others 0 or 1)

5.0

Can walk without help and rest for about 200 m. Disability severe enough to impair daily activity (e.g. working all day without special precautions). (A FS grade 5, the rest 0 or 1; or a combination of lower grades, which, however, go beyond the information applicable to level 4.0)

5.5

Can walk without help and rest for about 100 m. Disability severe enough to make normal daily activity impossible (FS equivalents such as level 5.0)

6.0

Intermittent, or constant on one side, support (crutch, stick, rail) is required to walk around 100 m without rest. (FS equivalents: combinations of more than two FS grade 3 plus

6.5

Constantly requires aids on both sides (crutch, stick, rail) to walk about 20 m without resting (FS equivalents like 6.0)

7.0

Unable to walk more than 5 m even with help. Largely bound to a wheelchair. Moves the wheelchair himself and transfers it without assistance (FS-equivalent combinations of more than two FS grade 4 plus, rarely pyramidal track grade 5 alone)

7.5

Unable to take more than a few steps. Bound to a wheelchair. Needs help for transfer. Moves the wheelchair himself, but is unable to spend the whole day in the wheelchair. May require a motorized wheelchair (FS equivalents such as 7.0)

8.0

Largely bound to bed or wheelchair; maintains itself largely independently. Mostly good use of the arms (FS-equivalent combinations mostly of grade 4 plus in several systems)

8.5

Mostly tied to bed, even during the day. Some useful use of the arms, some self-care possible (FS equivalents such as 8.0)

9.0

Helpless patient in bed. Can eat and communicate (FS equivalents are combinations, mostly grade 4 plus)

9.5

Completely helpless patient. Inability to eat, swallow, or communicate (FS equivalents are combinations of almost all Grade 4 plus)

10.0

Death due to MS

source

Kurtzke JF. Rating Neurologic Impairment in Multiple Sclerosis: An Expanded Disability Status Sclale (EDSS). Neurology. 1983 Nov; 33 (11): 1444-52.