Advances in Clinical Chemistry, Volume 119, the latest installment in this internationally acclaimed series, contains chapters authored by world-renowned clinical laboratory scientists, physicians and research scientists. Topics covered in this new release include Advances in Endotoxin Analysis, SARS-CoV-2 detection and surveillance, Osteopontin in Cancer, Gastrointestinal Hormones: History, Biology, and Measurement, Natriuretic Peptide Testing Strategies in Heart Failure: a 2023 Update, and Defining Allowable Total Error Limits in the Clinical Laboratory.