A new study cautions against using the QbTest as a standalone diagnostic or screening tool for ADHD. Researchers from the Universities of Southampton, Nottingham, Cardiff, and King's College London explored the accuracy and clinical utility of a widely used computerized test for attention-deficit/hyperactivity disorder (ADHD), called the QbTest. They found that, when used on its own, QbTest is not good enough to diagnose ADHD.