1. Advances in Endotoxin Analysis Palak Sondhi, Taiwo Adeniji, Dhanbir Lingden and Keith J. Stine 2. Molecular biology of SARS-CoV-2 and techniques of diagnosis and surveillance Takayuki Ishige 3. Osteopontin in Cancer Alpana Kumari, Dharambir Kashyap and Vivek Kumar Garg 4. Gastrointestinal Hormones: History, Biology, and Measurement Jens F. Rehfeld and Jens P. Goetze 5. Natriuretic Peptide Testing Strategies in Heart Failure: a 2023 Update Thanat Chaikijurajai, Hernan Rincon Choles and W. H. Wilson Tang 6. Defining Allowable Total Error Limits in the Clinical Laboratory Jill Palmer and Kornelia Galior