| 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 |
| 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 |
| 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 |
| BHCGTM | Beta HCG, Tumor Marker |
| OHBET | Beta Hydroxybutyrate |
| BTPBF | 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 |
| TBIL | Bilirubin, Total |
| BIOTS | Biotinidase, Serum |
| BISMU | Bismuth, Blood |
| BKVQB | BK Virus (BKV) Quant, Blood |
| BKDOT | BK Virus Quantitation, Urine |
| BLKWIL | Black Willow, IgE |
| 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 |
| UREAFL | Blood Urea Nitrogen, Body Fluid |
| 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 |
| BFTB | Body Fluid Total Bilirubin |
| 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 |
| BPPRP | Bordetella Pertussis by PCR |
| 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 |
