Challenges in the interpretation of amphetamine results: differences of reactivity between immunoassay and immunochromatography​Nerea Sainz-Pastor Edgar Martín Estel Julià Loredana Cosmina Sabau Elías Navas José Alcaraz Quiles Bernardino González de la Presa Marina Parra-Robert a Pharmacology and Toxicology Laboratory, Department of Clinical Biochemistry and Molecular Genetics, CDB, Hospital Clínic de Barcelona, Barcelona, Spainb CORE Laboratory, Department of Clinical Biochemistry and Molecular Genetics, CDB, Hospital Clínic de Barcelona, Barcelona, Spainon June 27, 2026 at 5:59 am