Introduction: Carbonmonoxide poisoning continues to be a majorhealth problem worldwide, especially in developing countries,and constitutes an important part of the patients admitted to thepediatric emergency clinics due to poisoning. The aim of this studywas to evaluate the correlation between clinical severity, morbidity,hospital stay, intensive care need, and full systemic effects in patientswho were followed up and treated for carbon monoxide poisoningin our pediatric emergency clinic.Methods: The study was performed between January 2013 and2015. We included patients under 18 years of age who were admittedto the pediatric emergency with carbon monoxide poisoning.Assessments were made prospectively. The epidemiologicalcharacteristics, complaints, physical examination and vital findingsof all patients were recorded. Carboxyhemoglobin (COHb) level,oxygen saturation, electrocardiography, complete blood count,liver and kidney functions, and cardiac enzymes were studied, andGlasgow Coma scale (GCS) was calculated.Results: The mean length of hospital stay for 232 patients wascalculated as 7.08±1 hours and the mean duration of exposure tocarbon monoxide gas was 3.17±2.5 hours. Higher COHb levels andcardiotoxicity were detected in patients with a longer duration ofexposure and a lower GCS and an increased intensive care need(p<0.01). There was no correlation between COHb levels and clinicalseverity, GCS, or intensive care unit need. However, it was foundthat high COHb levels (especially above 30%) increased cardiacinjury and neurological symptoms but did not cause a permanentsequela (p<0.05). None of the patients had permanent neurological,cardiac, or renal damage.Conclusion: We found that duration of exposure is the mostimportant and accurate parameter for the evaluation of clinicalcourse and morbidity. In patients with high COHb levels, the effectsare more prominent, however, we considered that there was nochange in sequelae at long-term follow up.