| RABBIT | Rabbit Epithelium, IgE, Serum, LAB1519 St. Luke's Hospital Cedar Rapids | 
      
        | FRFITM | Rabies Antibody Endpoint RFFIT/K-State Rabies Laboratory Manhattan/K-State Innovation Center | 
      
        | RASEM | Rape Seed, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | RASURI | Rasburicase Uric Acid, LAB2920 St. Luke's Hospital Cedar Rapids | 
      
        | RASPBM | Raspberry, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | RAT | Rat Epithelium, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | RATSPM | Rat Serum Protein, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | RATUPM | Rat Urine Protein, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | SORREL | Red Sorrel, IgE, Serum LAB2956 St. Luke's Hospital Cedar Rapids | 
      
        | RENAL | Renal Function Panel LAB19 UnityPoint Finley | 
      
        | RENALF | Renal Function Panel, Fasting LAB0019 UnityPoint Finley | 
      
        | RENINM | Renin Activity, Plasma Mayo Clinic Laboratories in Rochester | 
      
        | RPTL | Reptilase Time, Plasma Mayo Clinic Laboratories in Rochester | 
      
        | RETLMW | Reticulocyte Count LAB296 UnityPoint Finley | 
      
        | TXRHIG | Rh Immune Globulin Product LAB2053 UnityPoint Finley | 
      
        | RHIGSS | Rh Immune Globulin Workup (Inpatient) LAB2051 UnityPoint Finley | 
      
        | RHUF | RHEUMATOID FACTOR (QUANT) [LAB206] Pathology Laboratory Des Moines, IA | 
      
        | RHIZOP | Rhizopus nigricans, IgE, Serum, LAB1229 St. Luke's Hospital Cedar Rapids | 
      
        | VITB2M | Riboflavin (Vitamin B2), Plasma Mayo Clinic Laboratories in Rochester | 
      
        | RNPA | RIBONUCLEIC PROTEIN ANTIBODY, IGG [LAB772] Pathology Laboratory Des Moines, IA | 
      
        | RIBPA | RIBOSOMAL P PROTEIN ANTIBODY [LAB1399] Pathology Laboratory Des Moines, IA | 
      
        | RICE | Rice, IgE, Serum, LAB2698 St. Luke's Hospital Cedar Rapids | 
      
        | SROTA | Rotavirus Antigen, Stool, LAB443 UnityPoint Health/Des Moines | 
      
        | RPRNEO | RPR, NEONATAL [LAB3195] Pathology Laboratory Des Moines, IA | 
      
        | RPRRT | RPR, Response to Therapy, LAB5256 St. Luke's Hospital Cedar Rapids |