| BCD20 | B-Cell CD20 Expression by FLOW, Quant | — |
| IABCS | B-Cell Phenotyping Profile for Immunodeficiency & Immune Competence Assessment, Blood | — |
| BCELSA | B-Cell Subset Analysis | — |
| LYMTT | B. burgdorferi VIsE1/pepC10 Abs, Total by ELISA w/reflex | — |
| BDG | Babesia duncani (WA1) Antibody, IgG | — |
| BMAGM | Babesia microti Antibodies, IgG and IgM | — |
| BABPCR | Babesia Species by PCR | — |
| BACLS | Baclofen, Serum | — |
| ORGCU | Bacterial Identification | — |
| BV | Bacterial Vaginosis by TMA | — |
| BRYST | Baker/Brewer Yeast, IgE | — |
| BANANA | Banana IgE | — |
| BARBSP | Barbiturates, Serum or Plasma, Quant | — |
| BARBUQ | Barbiturates, Urine, Quantitative | — |
| BARLEY | Barley IgE | — |
| CSSG | Bartonella henselae (Cat Scratch) Antibodies IgG & IgM | — |
| BARTGM | Bartonella henselae & B. quintana Antibodies, IgG & IgM | — |
| BTNA | Bartonella Species by PCR | — |
| BMPM | Basic Metabolic Panel | Please see individual components for methodology |
| BASSBK | Bass Black IgE | — |
| BCRNGS | BCR-ABL1 Mutation Analysis for Tyrosine Kinase Inhibitor Resistance by Next Generation Sequencing | — |
| BCRABL | BCR::ABL by Reverse Transcription, Qualitative | — |
| BCRQT | BCR::ABL Quantitation p210 | — |
| BWSRSS | Beckwith-Wiedemann (BWS) & Russell-Silver Syndrome (RSS) | — |
| ALLBF | Beef, IgE | — |
| BENZS | Benzodiazepines, Serum or Plasma, Quant | — |
| BENZO | Benzodiazepines, Urine Quant | — |
| BGSEQ | Beta Globin (HBB) Gene Sequencing | — |
| BHCG | Beta HCG, Quantitative | Electrochemiluminescence Immunoassay |
| BHCGTM | Beta HCG, Tumor Marker | Electrochemiluminescence Immunoassay |
| OHBET | Beta Hydroxybutyrate | — |
| BTPF | Beta Trace Protein, Body fluid | — |
| B2GM | Beta-2 Glycoprotein 1 Antibodies, IgG & IgM | — |
| BET2 | Beta-2 Glycoprotein 1 Antibodies, IgG, IgM, IgA | — |
| B2GA | Beta-2 Glycoprotein 1 Antibody, IgA | — |
| B2MG | Beta-2 Microglobulin | — |
| B2MU | Beta-2-Microglobulin, Urine | — |
| UBICA | Bicarbonate, Urine | — |
| BAFTA | Bile Acids, Fractionated and Total by LC-MS/MS | — |
| BILA | Bile Acids, Total | — |
| DBIL | Bilirubin, Direct | Photometric, Colormetric Diazo Method |
| TBIL | Bilirubin, Total | Colorimetric, Diazo Method |
| BIOTS | Biotinidase, Serum | — |
| BISMU | Bismuth, Blood | — |
| BKVQB | BK Virus (BKV) Quant, Blood | — |
| BKDOT | BK Virus Quantitation, Urine | — |
| BLKWIL | Black Willow, IgE | — |
| BLASTQ | Blastomyces Antigen Quantitative by EIA, Urine | — |
| BLAAB | Blastomyces dermatitidis Abs by Immunodiffusion | — |
| BDABR | Blastomyces dermatitidis Antibodies by Immunoassay with Reflex to Immunodiffusion, Serum | — |
| BDAE | Blastomyces dermatitidis Antigen EIA | — |
| BDIAL | Bleeding Diathesis Profile, Limited | — |
| BLCPS1 | Blood Culture | — |
| BLDA | Blood Culture, BI | — |
| BCIDR | Blood Path Panel PCR | — |
| UREA | Blood Urea Nitrogen | Kinetic, Enzymatic UV Assay Method |
| UREAFL | Blood Urea Nitrogen, Body Fluid | Kinetic, Enzymatic UV Assay Method |
| BLUBRY | Blueberry IgE | — |
| BNPP | BNP - B Natriuretic Peptide | — |
| FCT | Body Fluid Cell Count and Differential | — |
| BCRY | Body Fluid Crystals | — |
| BFBLD | Body Fluid Culture (Bactec) | — |
| BFLIP | Body Fluid Lipase | Colorimetric Enzymatic Method |
| BFTB | Body Fluid Total Bilirubin | Colorimetric, Diazo Method |
| BPPP | Bordetella Pertussis & Parapertussis by RT-PCR | — |
| BPAAI | Bordetella pertussis Abs IgA Immunoblot | — |
| BPAGI | Bordetella pertussis Abs IgG Immunoblot | — |
| BPAMI | Bordetella pertussis Abs IgM Immunoblot | — |
| BPABA | Bordetella pertussis Antibodies, IgA | — |
| BPABAG | Bordetella pertussis Antibodies, IgA and IgG | — |
| BORDPAN | Bordetella pertussis Antibodies, IgA, IgG, & IgM | — |
| BPAB | Bordetella pertussis Antibodies, IgG & IgM w/reflex | — |
| BPABG | Bordetella pertussis Antibody, IgG by ELISA | — |
| LYGW | Borrelia burgdorferi, IgG by Immunoblot | — |
| BRAF | BRAF Mutation | — |
| BRZNUT | Brazil Nut IgE | — |
| HBOCSP | BRCA1 & BRCA2 Assoc. HBOC Syndrome Panel, Seq & Del/Dup | — |
| BROCLI | Broccoli IgE | — |
| BWCU | Bronch Wash Culture, Gram Stain | — |
| BALCT | Bronchial Alveolar Lavage Cell Count and Differential | — |
| BAAS | Brucella Antibody Screen IgG/IgM | — |
| BPAG | Bullous Pemphigoid Abs, IgG by ELISA | — |
| BUPR | Buprenorphine and Metabolites, Urine, Quantitative | — |
| BUSPE | Buspirone | — |
