quality control - eqas - autoimmunity - Antinuclear antibodies(ANA, anti-ENA, anti-dsDNA), 2 samples x 0.5 mL lyophilized serum/plasma each, 1 evaluation report Qualicont®, analytes: Antinuclear antibody (ANA), ENA screen, ENA differentiantion: U1-snRNP, Sm, Sm-RNP, SS-A (Ro52), SS-A (Ro60), SS-A (total), SSB, Scl 70, Jo1, centromer (CENP B), Antibodies against ds-DNA, code 251, survey in 2026.05