Answer BOF 8

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BOF 8
Rheumatoid factor , all are true except
1-is an antibody directed against Fc portion of IgG
2-may be IgG ,IgM or IgA class
3-is diagnostic of rheumatoid factor
4- can be detected by many lab methods
5-found in almost 100% of cases of secondary Sjögren's syndrome and Felty’s syndrome

Answer :3
1-true is an autoantibody
2-but we detect only IgM in the slide agglutination test
3-false ….does not reflect any thing apart from poor prognosis if found in high titer in RA
4-like slide tube agglutination, SCAT and Rose Waaler tests
5-true must be seropositive here

Revision Tip

Revise rheumatoid arthritis KEYS to SUCCESS in Medicine page 503-505

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