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A 45-year-old female asked:

What is apca blood test when checking for ra? my sed rate rheu factor and c reactive protein are all normal. i have stiff fingers and swollen tendons like trigger fingers in am.

2 doctor answers5 doctors weighed in
Dr. John Goldman
Rheumatology 55 years experience
Not know abbreviatio: There are a variety of tests we use. I do not know that abbreviation but ccp or cyclic citruilline antibodies are also tested. It is found in about 60 % of people with RA and is sometimes found in other conditions.
Dr. Ed Friedlander
Pathology 44 years experience
I'm afraid this was my typo for ACPA -- anti-citrullinated protein antibody. I apologize.
Jul 21, 2012
Dr. Ed Friedlander
Pathology 44 years experience
Best RA test: Anti-citrullinated protein antibody. Probably my typographical error -- acpa is considered by many to be more sensitive and more specific for rheumatoid arthritis than any of the old classic tests you have listed. So is anti-cyclic citrullinated protein. Your physician is familiar with these. Good luck.

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Last updated Jun 10, 2014

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