| IABCS | B-Cell Phenotyping Profile for Immunodeficiency and Immune Competence Assessment, Blood Mayo Clinic Laboratories in Rochester | 
      
        | BABG | Babesia microti IgG Antibodies, Serum Mayo Clinic Laboratories in Rochester | 
      
        | FBACS | Baclofen, Serum NMS Labs | 
      
        | LAB7126 | Bacterial Vaginosis Stain Barnes-Jewish Hospital Laboratory | 
      
        | LAB9788 | BAL, T-Cell Subset Barnes-Jewish Hospital Laboratory | 
      
        |  | Barbiturates, Urine Barnes-Jewish Hospital Laboratory | 
      
        | LAB785 | Bartonella Antibody Panel, IgG and IgM, Serum Mayo Clinic Laboratories in Rochester | 
      
        | BARRP | Bartonella, Molecular Detection, PCR, Varies Mayo Clinic Laboratories in Rochester | 
      
        | LAB15 | Basic Metabolic Panel (BMP) Barnes-Jewish Hospital Laboratory | 
      
        | LAB5546 | Basic Metabolic Panel plus Glucose (BMP plus Glucose) Barnes-Jewish Hospital Laboratory | 
      
        | LAB9762 | BCR::ABL1 t(9;22) major (p210) IS, Quantitative Barnes-Jewish Hospital Laboratory | 
      
        | LAB7547 | BCR::ABL1 t(9;22) minor (p190), Quantitative Barnes-Jewish Hospital Laboratory | 
      
        |  | BCR/ABL by FISH Analysis Washington University Cytogenetics | 
      
        | LAB27229 (BAKDM) | BCR/ABL1, Tyrosine Kinase Inhibitor Resistance, Kinase Domain Mutation Screen, Sanger Sequencing, Varies Mayo Clinic Laboratories in Rochester | 
      
        | FBEN | Benzene, Occupational Exposure, Blood Medtox Laboratories, Inc. | 
      
        | LAB2337 | Benzodiazepine Confirmation by Mass Spectrometry Barnes-Jewish Hospital Laboratory | 
      
        |  | Benzodiazepines Screen, Urine Barnes-Jewish Hospital Laboratory | 
      
        | LAB5702 | Beta-2 Glycoprotein Antibody, IgG Barnes-Jewish Hospital Laboratory | 
      
        | LAB5703 | Beta-2 Glycoprotein Antibody, IgM Barnes-Jewish Hospital Laboratory | 
      
        | B2MU | Beta-2 Microglobulin, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | LAB49 | Beta-2-Microglobulin Barnes-Jewish Hospital Laboratory | 
      
        | B2MC | Beta-2-Microglobulin (Beta-2-M), Spinal Fluid Mayo Clinic Laboratories in Rochester | 
      
        | LAB6096 | Beta-Crosslaps (C-telopeptide) Barnes-Jewish Hospital Laboratory | 
      
        | BGA | Beta-Galactosidase, Leukocytes Mayo Clinic Laboratories in Rochester | 
      
        | GBAW | Beta-Glucosidase, Leukocytes Mayo Clinic Laboratories in Rochester |