They are present in approximately 60 to 80 percent of people diagnosed with RA. Studies have found that, for many people, the antibodies precede the development of clinical symptoms by 5 to 10 years. If you have symptoms consistent with RA and a positive test for the antibody, an RA diagnosis is almost a certainty.Previously, seropositivity was defined in terms of an antibody called rheumatoid factor (RF).tudies have found that, for many people, the antibodies precede the development of clinical symptoms by 5 to 10 years. If you have symptoms consistent with RA and a positive test for the antibody, an RA diagnosis is almost a certainty.
Blood can be separated into two major components: Formed elements and Plasma. i. Blood cells or formed elements (about 45% of blood), which is composed mainly of. red blood cells (RBC) i.e. 99% of blood cells are RBC and the other 1% is white blood.
  Blood plasma is the liquid component of blood, in which the blood cells are suspended. It makes up about 55% of total blood volume.Blood plasma is prepared simply by sp â¦ inning a tube of fresh blood in a centrifuge until the blood cells fall to the bottom of the tube. The blood plasma is then poured or drawn off. Blood plasma is the liquid component of blood, in which the blood cells are suspended. It makes up about 55% of total blood volume.