The document summarizes a presentation given by Päivi Kanerva at the 11th International Gluten Workshop in Beijing, China in August 2012. The presentation discussed the reliability of measuring residual gluten in gluten-free foods. It noted that reliability can be affected by the variety of gluten-detecting antibodies used, reference materials, and changes to proteins from hydrolysis or deamidation during food processing. The presentation concluded that reliability can be improved by selecting the appropriate reference material and accounting for how different prolamins may react with antibodies and be modified during processing.