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.
Rheumatoid factor (RF) â Rheumatoid factor is an antibody found in many patients with rheumatoid arthritis. It is one of several criteria used in diagnosing RA, as 80 percent of RA patients have RF in their blood. A RF test can be positive in response to other inflammatory or infectious diseases other than RA.