Background: Bedside chest ultrasound emerge a sensitive tool with much higher sensitivity than plain chest x-ray. It avoids the cost, risk of transportation to perform the CT chest and that of radiation exposure. Aim of the Study: was to evaluate the sensitivity and the specificity of bedside ultrasound in the detection and the evaluation of chest conditions of critically ill patients in comparison of CT chest as the gold standard tool. Patients and Methods: This prospective study was conducted on a registry of 80 patients with different chest pathology admitted to the Medical-Surgical Intensive Care Unit of Bab Al Shaeria Hospital between March and November 2018. Results: bedside chest ultrasound sensitivity in detection and evaluation of pneumothorax, pleural effusion, and consolidation and Interstitial lung disease in comparison to CT chest showed sensitivity around 93 % with little cost, without risk of radiation exposure and transportation of critically ill patients. Conclusion: Bedside chest ultrasound is a highly sensitive and specific tool in the detection and evaluation of many chest conditions that eliminates the risk of transportation of unstable patients and that of radiation exposure and is easily accessible in resource limited areas.