Field Acuity, Triage Concordance, and Clinical Outcomes in Communicative and Clinically Stable Adults Transported by 112 Ambulance Services

Objective: To examine the relationship between field acuity, prehospital physiological findings, and emergency department outcomes in communicative and clinically stable adults transported by 112 ambulance services.Methods: This prospective single-center study included 393 adults brought by 112 ambulance to a tertiary emergency department between 30 September and 10 December 2025 who could personally complete a standardized field form. Sociodemographic variables were self-reported, whereas field acuity, categorized vital signs, and prehospital interventions were analyzed as patient-mediated field records. Forty-eight-hour revisits and 30-day mortality were verified from hospital and e-Nabız records. Logistic regression was used to identify predictors of ICU admission.Results: Of the patients, 56.7% were male and 31.4% were aged ≥65 years. Tachycardia, hypoxemia, critical hyperglycemia, and a high shock index were observed in 14.9%, 12.5%, 7.4%, and 8.5%, respectively. Emergency department discharge, ICU admission, 48-hour revisit, and 30-day mortality rates were 75.6%, 15.8%, 11.5%, and 5.4%. Agreement between field assessment and emergency department urgency was weak (κ=0.06). Urgent field classification, critical hyperglycemia, hypotension, and any prehospital intervention independently predicted ICU admission.Conclusion: In this selected cohort, urgent field classification, hypotension, critical hyperglycemia, and the need for prehospital intervention were associated with ICU admission. Findings should not be generalized to noncommunicative or severely unstable patients.