If youre Rh-negative and your baby is Rh-positive, your body will react to the babys blood as a foreign substance. When youre pregnant, blood from your baby can cross into your bloodstream, especially during delivery. Results from a rheumatoid factor test can be hard to understand. Most people are Rh-positive they have Rh factor. Smoking is a risk factor for developing rheumatoid arthritis. And some people who have rheumatoid arthritis will have low levels of rheumatoid factor in their blood.Ĭigarette smokers also may have positive rheumatoid factors. Some healthy people - usually older people - have positive rheumatoid factor tests, though it's not clear why. On separation of ABO type and Rh factor, there was a significant difference in distribution within the ABO blood type (Fisher exact, P 0. Inflammatory lung diseases, such as sarcoidosis. Among the COVID-19 population, both A-positive and O-positive phenotypes were more heavily represented, while B-positive and AB-positive populations were less represented.The remaining 15 of people do not have the Rh factor protein on their blood cells. About 85 of people have the Rh factor protein on their blood cells. Chronic infections, such as viral hepatitis B and C. Rhesus (Rh) factor is a genetic protein found on the surface of red blood cells.But a number of other diseases and conditions can raise rheumatoid factor levels, including: A higher level of rheumatoid factor in your blood is closely linked with autoimmune diseases, especially rheumatoid arthritis. ResultsĪ positive rheumatoid factor test result shows that you have a high level of rheumatoid factor in your blood.
After the test, your arm might be tender for a few hours, but you'll be able to resume most normal activities. Your blood sample is sent to a lab for testing. During a rheumatoid factor test, a member of your health care team will take a small sample of blood from a vein in your arm.
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