Welcome to the ERNDIM website for the management of external and internal quality programmes of analytes in the field of inborn errors of metabolism. External Quality Assurance For an overview of available EQA Schemes and detailed information on each of them, please click on the button “General Information” on the left. To submit results and download reports, please click on the button “Login” on the left, log in and choose the appropriate EQA Scheme. Internal Quality Assurance For an overview of available control materials, details of the respective materials, and to order them, please click on the button “General Information” on the left and then click on the button “Webshop” and click at “Control Materials” To submit results and to download reports, please click on the button “Login” on the left, log in, click on the button “Internal Control” and choose the appropriate control. To find instructions and explanation of the reports, please click General Information and click on 'Use Website'. The Internal Control System-UPDATE The calculation of the "Mean all Labs" in the Internal Control System has changed. For information: Click "General Information", the "Webshop" and click "Control Materials". On behalf of ERNDIM this website is managed by the MCA Laboratory located in the Streekziekenhuis Koningin Beatrix, Winterswijk, the Netherlands. For any questions please contact the website manager Irene de Graaf (i.degraaf@skbwinterswijk.nl).