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.
a rheumatoid factor rf blood test measures the amount of the rf antibody present in the blood normally antibodies are produced by the immune system to help destroy and eliminate invading bacteria and viruses that can cause diseasebut the rf antibody can attach to normal body tissue resulting in damagef rf is present the red blood cells clump together this method is often used to confirm the presence of rf nephelometry test this test mixes the blood being tested with antibodies that cause the blood to clump if rf is present