Influence of pneumatic tube system transport on cell count and spectrophotometry in cerebrospinal fluid​Marcus Clarin Joel Simrén Johanna Svanberg Hanna Fahlén Ulf Andreasson Henrik Zetterberg a Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Swedenb Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Swedenc Department of Clinical Chemistry and Transfusion Medicine, Institute of Biomedicine, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Swedend Department of Neurodegenerative Disease, UCL Institute of Neurology, London, UKe UK Dementia Research Institute at UCL, London, UKf Hong Kong Center for Neurodegenerative Diseases, Hong Kong, Chinag Wisconsin Alzheimer’s Disease Research Center, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USAh Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USAon December 17, 2025 at 7:26 am