Diagnostic Delay in the Emergency Department: Impact on Clinical Outcomes and Patient Prognosis

Abstract

Diagnostic delay in emergency care is difficult to judge because a disease that appears obvious after deterioration may have been clinically indistinct during the first encounter. This scoping review with critical narrative synthesis examined where delay becomes visible in the emergency diagnostic process, which mechanisms recur across different conditions, and when later diagnosis is associated with clinically important harm. Across appendicitis, sepsis, vascular and neurological emergencies, tuberculosis, and cross-condition studies, delay was seldom attributable to one failed decision. It more often developed when an early presentation remained nonspecific, a plausible working diagnosis narrowed further assessment, or residual uncertainty was not carried through discharge, pending results, and repeat attendance. Outcomes were most consequential when disease progression was time dependent and effective treatment had been available during the missed interval. The synthesis develops diagnostic revisability as a clinical safety concept. A provisional diagnosis remains revisable when uncertainty is documented, new information can reconnect with the diagnostic process, and return presentations alter rather than reset clinical reasoning. This approach does not demand certainty at first contact. It asks whether emergency care retains a practical route for changing the diagnosis before biological progression makes the correction unavoidable.