Sample stability of forty-two analytes in plasma or serum pools after one to four repeated −80 °C freeze-thaw cycles​Gustav Mikkelsen Ketil Thorstensen Ingrid Alsos Lian Lena Løfblad Gunhild Garmo Hov Arne Åsberg a Department of Laboratory Medicine, Clinical Chemistry, Trondheim University Hospital, Trondheim, Norwayb Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norwayon December 22, 2025 at 5:15 am