| Test Code | Test Name - (*) found by Test Code | Production Lab | Found by Synonym |
| ARRAT | ALDOSTERONE/RENIN ACTIVITY RATIO | ARUP | YES |
| RH4 | ANTIGEN TYPING, C (LITTLE) | NPL | YES |
| BCIAM | B CELL PHENOTYPING PROFILE FOR IMMUNODEF | MAYO | YES |
| BC20M | CD20 ON B CELLS | MAYO | YES |
| RC | CULTURE, RESPIRATORY | NPL | YES |
| EVP | ENTEROVIRUS BY PCR | NPL | YES |
| FS | FETAL MATERNAL BLEED, SCREEN | NPL | YES |
| RBCFL | FOLATE, RBC | ARUP | YES |
| HIVR | HIV, RAPID | NPL | YES |
| INFAB | INFLUENZA A & B, RAPID | NPL | YES |
| INFAR | INFLUENZA A, RAPID | NPL | YES |
| INFBR | INFLUENZA B, RAPID | NPL | YES |
| LPC | LEUKOPOOR RBC | NPL | YES |
| RITU | METHYLPHENIDATE AND METAB QUANT-URINE | ARUP | YES |
| MRSAP | MRSA BY PCR | NPL | YES |
| SSTIP | MRSA/MSSA SSTI BY PCR | NPL | YES |
| RAJI | RAJI CELL IMMUNE COMPLEX ASSAY | ARUP | |
| RSTP | RAST ALLERGEN PROFILE | NPL | |
| RAST5 | RAST, FIVE INDIVIDUAL ALLERGENS | NPL | |
| RAST4 | RAST, FOUR INDIVIDUAL ALLERGENS | NPL | |
| RAST1 | RAST, ONE INDIVIDUAL ALLERGEN | NPL | |
| RAST3 | RAST, THREE INDIVIDUAL ALLERGENS | NPL | |
| RAST2 | RAST, TWO INDIVIDUAL ALLERGENS | NPL | |
| REF | REF TEST | MISC | |
| RENAL | RENAL FUNCTION PANEL | NPL | |
| RENIN | RENIN ACTIVITY | ARUP | |
| XORTK | RESEARCH STUDY SPECIMEN KIT | NPL | |
| VRP | RESPIRATORY VIRUS PANEL, DFA | NPL | |
| RTCLN | RETICULIN AB, IGA WITH REFLEX TO TITER | ARUP | |
| RETIC | RETICULOCYTE COUNT | NPL | |
| RT3A | REVERSE T3 | ARUP | |
| RHG | RH IMMUNE GLOBULIN | NPL | |
| RH | RH TYPE ONLY | NPL | |
| RF | RHEUMATOID FACTOR | NPL | |
| RMSF | RICKETTSIA RICKETTSII (ROCKY MT FEVER) | ARUP | |
| RNP | RNP ANTIBODY | NPL | |
| RNPM | RNP(ENA) ANTIBODY, IGG | MAYO | |
| RMSFG | ROCKY MOUNTAIN SPOTTED FEVER ABS, IGG | ARUP | |
| RMSFM | ROCKY MOUNTAIN SPOTTED FEVER ABS, IGM | ARUP | |
| ROTA | ROTAVIRUS ANTIGEN | NPL | |
| RPR | RPR (SYPHILLUS SEROLOGY) | NPL | |
| RSV | RSV, ANTIGEN BY DFA | NPL | |
| RSVR | RSV, RAPID ANTIGEN | NPL | |
| RUB | RUBELLA ANTIBODY, IGG | NPL | |
| MEASG | RUBEOLA (MEASLES) AB, IgG | ARUP | |
| MEASL | RUBEOLA (MEASLES) AB, IGG/IGM | ARUP | |
| MEASM | RUBEOLA (MEASLES) AB, IGM | ARUP | |
| SIRL | SIROLIMUS BY TANDEM MASS SPECTROMETRY | ARUP | YES |
| SSA | SSA (RO) ANTIBODY | NPL | YES |
| RS | STREP GROUP A RAPID SCREEN | NPL | YES |
| RSPLS | STREP GRP A RAPID SCN W/ REFLEX TO TC | NPL | YES |
| SYNRF | SYNOVIAL RHEUMATOID FACTOR | NPL | YES |
| TRS | TOTAL REDUCING SUBSTANCES, URINE | NPL | YES |
| URIC | URIC ACID, SERUM | NPL | YES |
| VREP | VRE BY PCR | NPL | YES |