This free monthly podcast is part of Clinical Chemistry. Clinical Chemistry is the leading forum for peer-reviewed, original research on innovative practices in today's clinical laboratory. In addition to being the most cited journal in the field (24,297 citations in 2009), Clin Chem has the highest Impact Factor (6.263 in 2009) among journals of clinical chemistry, clinical (or anatomic) pathology, analytical chemistry, and the subspecialties, such as transfusion medicine, clinical microbiology.