Diagnostic trajectories in primary care at 12 months: an observational cohort study.

Missed or delayed diagnosis in primary care may result in serious complications for patients. This prospective study followed adults presenting to primary care with new or unresolved symptoms for 12 months. 32% of patients received a diagnosis within one month; most of the rest still did not have a diagnosis at 12 months (50%). The authors suggest interventions aimed at improving diagnosis should be system-based, not specific to a single medical issue or population.