My grandson has been having pains in his joints for a few weeks. They come and go and affect different joints, such as ankles, knees, elbows etc. He went to the doctor and was told his RA factor is so high they think the lab must have made a mistake. They are doing more tests, but in the meantime I just wanted to know what the normal range is for RA factor. Thanks in advance for any information and/or suggestions.