Dejibo,

Devics is known as Neuromyelitis Optica (NMO). This link will explain the differences between NMO and MS:

http://www.myelitis.org/nmo.htm

http://www.guthyjacksonfoundation.or...-need-to-know/

There is a blood test for NMO that your neuro can order...Antibody NMO-IgG. This is done through the Mayo Clinic.

BTW: I have had the blood test.