Raltegravir see antiretroviral therapeutic drug monitoring
RAST see specific IgE (allergy) tests
Red blood cell count see FBC
Red cell mass/plasma volume estimation no longer available
Red cell osmotic fragility No longer available - see EMA test for red cell membrane abnormalities
Reducing substances and sugar chromatography Tests no longer offered.
Renal dialysis virology see virology screen for renal dialysis
Renal stone former investigations (metabolic stone screen)
Respiratory tract infection virology see upper/lower respiratory tract infection - diagnostic virology
Rh D testing see foetal Rh D testing
Rheumatology virology see haematology and rheumatology - diagnostic virology
Rhinorrhoea fluid analysis (?CSF) see beta-2 transferrin (for ?CSF-containing fluids)
Riboflavin see vitamin B2
Rivotril see Clonazepam
RNP antibody see ENA antibody
Ro antibody see ENA antibody
Rotavirus see gastroenteritis PCR
Rubella see