Main Campus: Chesterfield, MO 63017 | 
Tests
- Radioactive abscess scan
- Radioactive iodine uptake
- Radioactive iodine uptake and scan test - thyroid
- Radiograph - dental
- Radiography
- Radionuclide - gallbladder
- Radionuclide cisternogram
- Radionuclide cystogram
- Radionuclide renal perfusion scan
- Radionuclide ventriculography (RNV)
- RAIU
- Random blood sugar
- Random plasma renin
- Rapid eye movement studies
- Rapid plasma reagin test
- Rapid strep test
- RAST test
- RBC (or erythrocyte) cholinesterase
- RBC count
- RBC G6PD test
- RBC indices
- RBC nuclear scan
- RBC urine test
- Rectal biopsy
- Rectal bleeding - biopsy
- Rectal bleeding - sigmoidoscopy
- Rectal culture
- Rectal polyps - biopsy
- Rectal sigmoidoscopy
- Red blood cell casts
- Red blood cell count
- Red blood cell indices
- Red blood cells in urine
- Refraction
- Refraction test
- Regadenoson stress test
- Renal angiogram
- Renal angiography
- Renal arteriography
- Renal artery - CTA
- Renal artery stenosis - arteriography
- Renal biopsy
- Renal perfusion scintigraphy
- Renal perfusion scintiscan
- Renal scan
- Renal tubular epithelial casts
- Renal vein thrombosis - venogram
- Renal venogram
- Renal biopsy
- Renin blood test
- Renogram
- Resin T3 uptake
- Respiratory failure - ABG
- Respiratory inductance plethysmography
- Respiratory syncytial virus antibody test
- Reticulocyte count
- Retinal photography
- Retinol test
- Retinopathy - fluorescein
- Retrograde cystography
- Retrograde ureteral brush biopsy cytology
- Rh incompatibility - erythrocyte distribution
- Rh typing
- Rheumatoid arthritis - synovial biopsy
- Rheumatoid factor (RF)
- Rhinoscopy
- Right heart catheterization
- Right heart ventriculography
- Right upper quadrant sonogram
- Rigid sigmoidoscopy
- Rotavirus antigen test
- Routine eye examination
- Routine sputum culture
- Routine urine test
- RPR test
- RSV antibody test
- RSV serology
