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.
RA Blood Tests. There are a number of blood tests that can be used when doctors are trying to find out if you have RA, as well as indicators of how the disease is managed. Some of the most common blood tests are: Rheumatoid Factor (RF). RF is a type of antibody that may be associated with inflammation.