Conclusion
In summary, while SARS-CoV-2 Real-Time RT-PCR is considered as a gold standard method 46, it is accompanied by false-negative results and less than 100% sensitivity47. Even though the proper period for sampling is the first week after symptom onset, many cases are asymptomatic carriers with pulmonary involvement. COVID-19 pneumonia displays the lung involvements and lesions even in asymptomatic patients within 1-3 weeks. Besides, blood parameters are easily accessible and commonly used everywhere. Relating the valuation of CT scan features with clinical and laboratory outcomes possibly assist the timely diagnosis of COVID-19 pneumonia. It was clarified in our study that lymphopenia < 20% and lung CT involvement > 50% were intensely related todisease severity, mortality, and prolonged hospitalization.