Cutoff-dependent test responses and age, sex and seasonal variations of the alcohol biomarkers phosphatidylethanol (PEth) and carbohydrate-deficient transferrin (CDT)​Anders Helander Fredrik Sparring a Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Swedenb Departments of Clinical Chemistry and Clinical Pharmacology, Karolinska University Hospital, Stockholm, Swedenc Avonova Health AB, Skara, Swedenon June 1, 2026 at 8:43 am