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.
COMPOSITION OF BLOOD Blood is composed of a yellowish fluid, called plasma, in which are suspended the millions of cells that constitute about 45 per cent by volume of whole blood. It has a characteristic odour and a relative density between 1.056 and 1.066.In an average healthy adult, the volume of blood is one-eleventh of the body weight, or between 4.5 and 6 litres (5 and 6 qt).A great portion of the plasma is composed of water, a medium that facilitates the circulation of the many indispensable factors of which blood is composed.n an average healthy adult, the volume of blood is one-eleventh of the body weight, or between 4.5 and 6 litres (5 and 6 qt).