Kurtzke modified the Disability Status Scale (DSS) to allow for finer gradings of disability. It incorporates the functional system grades to help quantitate the findings. The author is from Georgetown University in Washington, D.C.
The EDSS ranges from 0 (normal) to 10 (fatal), with increments of 0.5. This is based on involvement of 7 functional systems.
Functional Level
EDSS
normal
0
no disability but minimal signs
1
minimal disability
2
moderate disability
3
severe
4 - 7
bed or chair bound
8 - 9
fatal
10
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