Last week i went to my PCP doctor for something and ordered me a IGG blood test, saying it was more sophisticated test for RA. My factor when first taken was only 18 then went down to 14. With this test it was negative. Does anyone know anything about the IGG test? and is it accurate?
This http://www.hopkins-arthritis.som.jhmi.edu/rheumatoid/rheum_c lin_pres.html#labo will take you to Johns Hopkins website. If you scroll about halfway down there is a discussion about IgG under the heading Serology.
It's basically another name for an RF test.