| 16451-7 | Beryllium (Urine, qualitative) | DRUG/TOX |
| 16452-5 | Beta alanine (Urine, qualitative) | CHEM |
| 16453-3 | Beta aminoisobutyrate (Urine, qualitative) | CHEM |
| 16454-1 | Beta galactosidase (Blood) | CHEM |
| 16455-8 | Beta hydroxybutyrate (CSF) | CHEM |
| 16456-6 | Beta hydroxybutyrate (Urine) | CHEM |
| 16457-4 | Beta-N-acetylhexosaminidase.A in Leukocytes | CHEM |
| 16458-2 | Bethanechol | DRUG/TOX |
| 16459-0 | Bicarbonate (Body Fluid) | CHEM |
| 1646-9 | Xylose in 5 hour Urine --post dose PO | CHAL |
| 16460-8 | Bicarbonate (CSF) | CHEM |
| 16461-6 | Bicarbonate (Red Blood Cells) | CHEM |
| 16462-4 | Bicarbonate (Amniotic Fluid) | CHEM |
| 16463-2 | Bile acid.dihydroxy | CHEM |
| 16464-0 | Bile acid in Exhaled gas | CHEM |
| 16465-7 | Bile acid (Urine) | CHEM |
| 16466-5 | Bile acid.trihydroxy | CHEM |
| 16467-3 | Bismuth (Blood, qualitative) | DRUG/TOX |
| 16468-1 | Bismuth (Urine, qualitative) | DRUG/TOX |
| 16469-9 | Bismuth/Creatinine (Urine) | DRUG/TOX |
| 1647-7 | Tuberculosis reaction wheal --3 days post 25 TU intradermal | CHALSKIN |
| 16470-7 | Blastomyces dermatitidis Ab (qualitative, complement fixation) | MICRO |
| 16471-5 | Blastomyces dermatitidis Ab | MICRO |
| 16472-3 | Blastomyces dermatitidis rRNA (qualitative, probe) | MICRO |
| 16473-1 | Bordetella parapertussis Ab | MICRO |
| 16474-9 | Bordetella pertussis Ab (complement fixation) | MICRO |
| 16475-6 | Borrelia burgdorferi Ab (CSF, qualitative, immunoassay) | MICRO |
| 16476-4 | Borrelia burgdorferi Ab (Body Fluid, qualitative, immunoassay) | MICRO |
| 16477-2 | Borrelia burgdorferi Ab (Body Fluid, qualitative) | MICRO |
| 16478-0 | Borrelia burgdorferi IgA Ab (qualitative, immunoassay) | MICRO |
| 16479-8 | Borrelia burgdorferi IgA Ab (CSF, qualitative, immunoassay) | MICRO |
| 1648-5 | Tuberculosis reaction wheal --3 days post 5 TU intradermal | CHALSKIN |
| 16480-6 | Borrelia burgdorferi IgG Ab (qualitative, immunoassay) | MICRO |
| 16481-4 | Borrelia burgdorferi IgG Ab (Body Fluid, immunoassay) | MICRO |
| 16482-2 | Borrelia burgdorferi IgM Ab (Body Fluid, immunoassay) | MICRO |
| 16483-0 | Borrelia hermsii in Specimen (qualitative, organism specific culture) | MICRO |
| 16484-8 | Boysenberry IgE Ab | ALLERGY |
| 16485-5 | Bromodiphenhydramine (Urine) | DRUG/TOX |
| 16486-3 | Brucella abortus IgA+IgG+IgM Ab | MICRO |
| 16487-1 | Brucella abortus IgG Ab (agglutination) | MICRO |
| 16488-9 | Brucella abortus IgG Ab (complement fixation) | MICRO |
| 16489-7 | Brucella melitensis Ab (latex agglutination) | MICRO |
| 1649-3 | Calcitriol | CHEM |
| 16490-5 | Brucella suis Ab (latex agglutination) | MICRO |
| 16491-3 | Brush border Ab (qualitative, immunofluorescence) | SERO |
| 16492-1 | Bufotenine (Urine) | DRUG/TOX |
| 16493-9 | Bufotenine | DRUG/TOX |
| 16494-7 | Bumetanide (Urine) | DRUG/TOX |
| 16495-4 | Buprenorphine | DRUG/TOX |
| 16496-2 | Buprenorphine (Urine) | DRUG/TOX |