It has been estimated that around 20% of patients attending their GP are at risk from their drinking or have an alcohol use disorder. Without using specific screening tools GPs may typically detect about 40% of cases they see, but miss the majority. The study authors suggest a single or two question approach to initial screening, followed by either the CAGE or AUDIT test for those who are positive, and onward referral for those who test positive on the more in-depth questionnaire.