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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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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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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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Salmonella Culture (Stool)
This test looks for salmonella bacteria in your stool. Having these bacteria in your stool means you have a salmonella infection.
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Uniparental Disomy
This test is used to see if a child has certain chromosome changes.
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Urea Nitrogen Clearance (Urine)
This test measures the amount of urea nitrogen in your urine. The test can help diagnose kidney problems.
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Varicella-Zoster Virus Antibody
This test looks for antibodies in your blood that your body makes against the varicella-zoster virus. The virus causes chickenpox and shingles.
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VDRL (CSF)
This test looks for signs of neurosyphilis in your cerebrospinal fluid. Neurosyphilis happens when syphilis isn't treated and spreads to the spinal cord and brain.
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