Baclofen Quantitative, Fluid Bartonella Species by PCR Baclofen Quantitative, Serum or Plasma Bartonella Species by PCR, Whole Blood Bacterial Strain Characterization by Pulsed-Field Gel Electrophoresis Basic Metabolic Panel Benzodiazepines, Urine Screen with Reflex to Quantitation Beta-2 Transferrin Bath Salts Panel, Urine Benzodiazepines, Urine, Quantitative Beta-2-Microglobulin, Urine B-Cell CD20 Expression Benztropine Quantitative, Serum or Plasma Beta-Catenin-1 by Immunohistochemistry B-Cell Clonality Screening (IgH and IgK) by PCR Beryllium Lymphocyte Proliferation, Blood Beta-hCG, Quantitative (Tumor Marker) B-Cell Memory and Naive Panel Beryllium, Serum or Plasma Beta-hCG, Quantitative (Tumor Marker), CSF