| 91027 | B-2 Glycoprotein |
| 91029 | B-2 Microglobulin [Serum] |
| 91030 | B-2 Microglobulin [Urine] |
| 2620 | B-Type Natriuretic Peptide |
| 2140 | B12 |
| 91311 | Barbiturates, GCMS |
| 91028 | Bartonella henselae Antibodies IgG / IgM |
| 1942 | Basic Metabolic Panel |
| 2141 | Bence Jones Protein |
| 91312 | Benzodiazepine, GCMS |
| 91048 | Beta Carotene, Serum Total |
| 2651 | Beta HCG, Tumor |
| 91032 | Beta Hydroxybutyric Acid |
| 91027 | Beta-2 Glycoprotein 1 Antibodies, IgG/IgM |
| 91029 | Beta-2-Microglobulin, Serum |
| 91030 | Beta-2-Microglobulin, Urine |
| 2130 | Beta-hCG, Qual [Serum] |
| 2336 | Beta-hCG, Qual [Urine] |
| 2135 | Beta-hCG, Quant [Serum] |
| 1025 | Bicarbonate |
| 91328 | Bile Acids, Total |
| 1019 | Bilirubin, Total |
| 2014 | Bilirubin, Total + Direct |
| 2006 | Bilirubin, Total Newborn |
| 91413 | Biotinidase |
| 91356 | Bismuth, Blood |
| 91418 | BK Virus Quantitative by PCR |
| 4040 | Blood Culture |
| 3805 | Blood Type |
| 1022 | Blood Urea Nitrogen |
| 1942 | BMP |
| 2620 | BNP |
| 91372 | Bone Alkaline Phosphatase |
| 4031 | Bordella Pertussis, Culture |
| 91319 | Bordetella Pertussis PCR |
| 4043 | Bordetella Pertussis, DFA |
| 91156 | Borrelia burgdorferi Antibodies, IgG / IgM Western Blot |
| 2330 | Borrelia burgdorferi Antibody, Total |
| 2620 | Brain Natriuretic Peptide |
| 2629 | Breast Cancer Antigen 15-3 |
| 2629 | BRM |
| 91295 | Brucella |
| 91390 | Brucella Abs, IgM + IgM |
| 91390 | Brucella Antibodies, IgG / IgM |
| 1022 | BUN |
| 91033 | Bupropion |