| 2337 | RA Factor |
| 2342 | RA Factor, Synovial Fluid |
| 91270 | Rapamune |
| 91270 | Rapamycin |
| 4055 | Rapid Group A Strep w/Reflex |
| 4014 | Rapid Group A Strep [Without Reflex] |
| 8545 | RAST NW Region #9 [IgE Rast] |
| 8555 | Rast NW Region Pollen Panel [IgE Rast] |
| 3015 | RBC |
| 3015 | Red Blood Cell Count |
| 4614 | Reducing Sub, Fecal |
| 1941 | Renal Function Panel |
| 91196 | Renin Activity |
| 4095 | Requested Susceptibility |
| 2470 | Respiratory Syncytial Virus Panel [DFA] |
| 2464 | Respiratory Syncytial Virus DFA |
| 2438 | Respiratory Syncytial Virus, Rapid |
| 2471 | Respiratory Virus, Adenovirus |
| 2473 | Respiratory Virus, Parainfluenza |
| 91374 | Reticulin Antibody, IgA w/Reflex |
| 91255 | Reticulin Antibody, IgG |
| 3120 | Reticulocyte Count, Automated |
| 91226 | Retinol |
| 91197 | Reverse T3 |
| 2337 | Rheumatoid Factor |
| 2342 | Rheumatoid Factor, Synovial Fluid |
| 93549 | Ri Antibody |
| 91295 | Rickettsia |
| 91199 | Rickettsia Antibodies |
| 91198 | Risperidone |
| 91199 | Rocky MTN Spotted Fever Antibodies, IgG/IgM |
| 2319 | Rotavirus Antigen |
| 1033 | RPR |
| 2470 | RSV Panel, DFA |
| 2464 | RSV, DFA |
| 2438 | RSV, Rapid |
| 2340 | Rubella |
| 2643 | Rubella Ab, IgG |
| 91201 | Rubella Antibody, IgM |
| 91161 | Rubeola Antibody, IgG |
| 2275 | Rule Out MI Panel |
| 91186 | Rythmol |