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Health Library
Red Blood Cell Count
A red blood cell (RBC) count is a blood test that measures the number of red blood cells, or erythrocytes, in your bloodstream.
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Red Blood Cell Antibody
This test looks for antibodies to red blood cells (RBCs) in your blood. These antibodies can cause problems during blood transfusions or, if you're pregnant, with your unborn baby.
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Retic Count
This test measures the number of reticulocytes in your blood. It can be used to diagnose anemia and find out why you have a disease.
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Rheumatoid Factor (Blood)
This test measures the level of a substance called rheumatoid factor in your blood. It helps your doctor find out whether you have rheumatoid arthritis.
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Rocky Mountain Spotted Fever (Blood)
This blood test is used to look for antibodies that your body makes to fight Rocky Mountain spotted fever, a serious bacterial infection caused by a tick bite.
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Rotavirus (Stool)
This stool test is used to diagnose a rotavirus infection, which causes vomiting and diarrhea.
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Rubella
This test measures the amount of rubella antibodies in your blood. If you're pregnant, it's especially important to know if you have immunity against this virus.
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Rubeola Antibody (Blood) Test
This test finds out if you have been exposed to the virus that causes measles, an extremely contagious disease.
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Salicylate (Blood)
This test looks for high levels of salicylate, the main ingredient in aspirin. It may be used to diagnose an aspirin overdose or to keep track of people taking high doses for arthritis.
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