| YRABI | Rabies Antibody Screen | — |
| YRBCBAND | RBC Band 3 Protein Reduction in Hereditary Spherocytosis | — |
| YFORB | RBC Folate | — |
| YRBCME | Red Blood Cell Membrane Evaluation, Blood | — |
| YRENFP | Renal Function Panel | Please see individual components for methodology |
| YREN | Renin Activity | — |
| YREPTL | Reptilase Time with Reflex to Reptilase Time 1:1 Mix | — |
| YRESP | Respiratory Panel Inf A/B, RSV, COVID | Respiratory Panel Inf A/B, RSV, COVID |
| YRESPP | Respiratory Pathogen Panel by PCR | — |
| YRVDFA | Respiratory Viruses, DFA | — |
| YRTIH1 | Reticulocyte Count | Fluorescent Flow Cytometry; DC Impedance with Hydrodynamic Focusing; Cyanide-Free SLS Method |
| YRBP | Retinol Binding Protein | — |
| YREVT3 | Reverse T3 (RPS) | — |
| YRFPS | Rheumatoid Factor | Particle-Enhanced Immunoturbidimetric Assay |
| YRFFO | Rheumatoid Factor Body Fluid | — |
| YRFPAN | Rheumatoid Factors, IgA, IgG & IgM by ELISA | — |
| YFRDG | Rhodotorula, IgE | — |
| YRPPA | Ribosomal P Protein Antibody | — |
| YRICE | Rice IgE | — |
| YRIFAM | Rifampin Level, Ser/Plas | — |
| YRISAP | Risankizumab Quantitation with Antibodies | — |
| YROMA | Risk of Ovarian Malignancy Algorithm | — |
| YRISP | Risperidone and Metabolite | — |
| YRIT | Ritalin (Methylphenidate) | — |
| YRITUX | Rituxan Therapy Panel (CD3, CD19, CD20) | — |
| YRIVAR | Rivaroxaban, Anti-Xa, Plasma | — |
| YRNAP3 | RNA Polymerase III AB, IgG | — |
| YRNPABS | RNP (Ribonucleic Protein) (ENA) Antibody, IgG | — |
| YRMSG | Rocky Mountain Spotted Fever (Rickettsia) IgG | — |
| YRSFGM | Rocky Mountain Spotted Fever (Rickettsia) IgG & IgM | — |
| YRMSM | Rocky Mountain Spotted Fever (Rickettsia) IgM | — |
| YAGROTA | Rotavirus Antigen | Qualitative Enzyme Immunoassay (EIA) |
| YRPRR | RPR | — |
| YRPRQR | RPR, Quantitative | — |
| YRUBIGG | Rubella Antibody, IgG | Electrochemiluminescence Immunoassay |
| YRUBMT | Rubella Antibody, IgM | — |
| YRUFIN | Rufinamide | — |
| YRUNX1 | RUNX1-RUNX1T1 (AML1-ETO) t(8;21) Detection, Quantitation | — |
