SHORT REPORTSRemember ‘a posteriori diagnosis’ of carbon monoxide poisoningPerren, Andreasa; Marone, ClaudiobAuthor Information aIntensive Care Unit bDepartment of Internal Medicine, Ospedale Regionale Bellinzona e Valli, Bellinzona, Switzerland Correspondence and requests for reprints to Andreas Perren, Intensive Care Unit, Ospedale Regionale Bellinzona e Valli, 6500 Bellinzona, Switzerland E-mail: Perren email@example.com European Journal of Emergency Medicine: October 2005 - Volume 12 - Issue 5 - p 259-260 Buy Abstract Objectives To raise awareness of the possibility of carbon monoxide poisoning as a diagnosis in the emergency department and to present the little known fact that it is possible to diagnose carbon monoxide poisoning retrospectively. Method Presentation of a case report, review of the literature. Results Persistence of elevated carboxyhaemoglobin levels in a stored vacutainer blood sample. Conclusion Carbon monoxide poisoning is common but often goes unrecognized. This method may help to decrease the number of overlooked cases and thereby possibly prevent further exposure and acute or chronic sequelae. © 2005 Lippincott Williams & Wilkins, Inc.