An Rh test is done in early pregnancy to check a woman's blood type. If she is Rh-negative, she can get a shot of Rh immunoglobulin that almost always prevents sensitization from occurring. Problems from Rh sensitization have become very rare since Rh immunoglobulin was developed. In general, there's nothing you have to do before this test, unless your doctor tells you to.
A health professional uses a needle to take a blood sample, usually from the arm. When a blood sample is taken, you may feel nothing at all from the needle. Or you might feel a quick sting or pinch. There is very little chance of having a problem from this test. When a blood sample is taken, a small bruise may form at the site. The following table shows the compatibility of blood types between blood donors and recipients.
Read the table as follows: A person who has A-negative blood can receive A-negative or O-negative blood. Minor antigens other than A, B, and Rh on the red blood cells are also checked for a match before a blood transfusion. Gabica MD - Family Medicine. Author: Healthwise Staff. Medical Review: E. This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.
Your use of this information means that you agree to the Terms of Use and Privacy Policy. Learn how we develop our content. To learn more about Healthwise, visit Healthwise. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. Skip Navigation. Top of the page. Test Overview Blood type tests are done before a person gets a blood transfusion and to check a pregnant woman's blood type.
If your red blood cells have: The A antigen. The B antigen. Neither the A nor B antigen. O- blood is the blood type in the highest demand.
O- blood is the preferred blood type for people with underdeveloped immune systems, including premature babies and cancer patients. Oneblood Blog Subscribe to our blog to read inspiring stories and get the latest news. Follow on Twitter. All Blogs. Oneblood Blog Subscribe to our blog to read inspiring stories and get the latest news Email.
Popular Articles. What Makes Blood Types Rare? We use cookies to provide and improve our services. By using our site, you consent to cookies. Blood is also classified by rhesus Rh factor. If your blood has the Rh factor, you're Rh positive. If your blood lacks the Rh factor, you're Rh negative. Ideally, blood transfusions are done with donated blood that's an exact match for type and Rh factor.
Even then, small samples of the recipient's and donor's blood are mixed to check compatibility in a process known as crossmatching.
In an emergency, type O negative red blood cells may be given to anyone — especially if the situation is life-threatening or the matching blood type is in short supply. There is a problem with information submitted for this request.
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