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Rabies serology
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Rectal swab (Neisseria gonorrhoeae culture)
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Rectal swab for resistant organisms - see multi resistant Gram negative bacilli screens
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Reducing Substances
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Renal biopsy
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Renal Stone Analysis
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Renin
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Respiratory PCR - see influenza and extended respiratory PCR for details
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Reticulocyte
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Rheumatoid Factor
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Ribosomal-P
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Rickettsial PCR
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Rickettsial serology
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RNP
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Ro antibody
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Rotavirus & Adenovirus
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Rubella (German measles) IgG (immunity screen)
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Rubella (German measles) IgM (infection screen)
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Rubella (German measles) RNA RT-PCR (REF)