1 Cold hands and Itching skin and Cold feet (10 causes). 2  Cold hands and Itching skin and Weakness (10 causes). 3  Cold hands and Itching skin and Breathing difficulties (9 causes). 4  Cold hands and Itching skin and Confusion (9 causes).
Rheumatoid factor (RF) Rheumatoid factor (RF) is a blood test that measures the amount of the RF antibody in the blood. Most of the time, blood is drawn from a vein located on the inside of the elbow or the back of the hand. In infants or young children, a sharp tool called a lancet may be used to puncture the skin.
Various blood tests may be used to help diagnose RA, determine its severity, and detect complications of the disease. Rheumatoid Factor. In RA, antibodies in the blood that collect in the synovium of the joint are known as rheumatoid factor.In about 80% of cases of RA, blood tests reveal rheumatoid factor.arious blood tests may be used to help diagnose RA, determine its severity, and detect complications of the disease. Rheumatoid Factor. In RA, antibodies in the blood that collect in the synovium of the joint are known as rheumatoid factor.