Devics testing, old diagnosis


I just wondered if it’s routine to test for this now? I was diagnosed 17 years ago when I was 18 with rr ms and have recently had a flare up of symptoms, my recent mri shows no new active lesions but progression on my old ones. Anyway the nurse sent me off for this blood test this morn and just wondered if that’s how it goes now? I’ve gone on to have four children without relapse but only recently started feeling poorly again. Any feedback greatly received, thank you :slight_smile: