Rheumatoid factor (RF) is part of the immune systemâs overactive response. It shows up in the blood of about 70% to 80% of people with RA. High levels of it are linked to more severe cases.Drawbacks: It misses 20% to 30% of cases of RA. It also shows up in other conditions, including: 1  Chronic hepatitis.ou could have these antibodies years before you get RA symptoms. This test can also predict cases of RA that could become severe. Drawbacks: It misses 10% to 15% of cases of RA.
Orange is a city located in Orange County, California. It is approximately 3 miles (4.8 kilometers) north of the county seat, Santa Ana. Orange is unusual in this region because many of the homes in its Old Town District were built prior to 1920.
The Orange County School of the Arts (OCSA) was founded in 1987 and reorganized as a public charter school on April 20, 2000. During that time the school was relocated from its primary facility at Los Alamitos High School to the Santa Ana Unified School District.