The Karnofsky Rating Scale was designed as a measure of disability
in general and is not very specific (or suitable) to CFS.

It is found here:
http://www.tertius.net.au/foothold/scales/karnofsky.html
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Karnofsky Rating Scale

100
Normal with no complaints or evidence of disease.

90
Able to carry on normal actrivity but with minor signs of illness present.

80
Normal activity but requiring effort. Signs and symptoms of disease more
prominent.

70
Able to care for self, but unable to work or carry on other normal activities.

60
Able to care for most needs, but requires occasional assistance.

50
Considerable assistance and frequent medical care required; some self-care
possible.

40
Disabled, requiring special care and assistance.

30
Severely disabled; hospitalization required but death not imminent.

20
Extremely ill; supportive treatment and/or hospitalization required.

10
Imminent Death.

0
Death