a- Is an antibody directed against Fc portion of IgG.
b- May be of IgG, IgM, or IgA class.
c- Is diagnostic of rheumatoid arthritis.
d- Can be detected by many lab methods.
e- Found in almost 100% of cases of secondary Sjogren's syndrome and Felty’s syndrome.
The correct answer is c.
- a - true, is an autoantibody.
- b - but, we detect only IgM in the slide agglutination test.
- c - false; does not reflect any thing apart from poor prognosis if found in high titer in RA.
- d - like slide tube agglutination, SCAT, and Rose Waaler tests. e-true; these are seropositive.