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.
The Rheumatoid Factor. The rheumatoid factor (RF) is an antibody in the blood linked to RA and other auto-immune diseases. While high levels of RF in a patient's system may suggest that the patient has or will develop RA in the future, the RF test is not a sole indicator.