Chest CT Can Distinguish Negative From Positive Lab Results
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The purpose of this study was to explore the value of CT in the diagnosis of COVID-19 pneumonia, especially for patients who have negative initial results of reverse transcription–polymerase chain reaction (RT-PCR) testing.

Patients with COVID-19 pneumonia from January 19, 2020, to February 20, 2020, were included. All patients underwent chest CT and swab RT-PCR tests within 3 days. Patients were divided into groups with negative (seven patients) and positive (14 patients) initial RT-PCR results. The imaging findings in both groups were recorded and compared.

Results:
- Twenty-one patients with symptoms (nine men, 12 women; age range, 26–90 years) were evaluated.
- Most of the COVID-19 lesions were located in multiple lobes (67%) in both lungs (72%) in this study.
- The main CT features were ground-glass opacity (95%) and consolidation (72%) with a subpleural distribution (100%). Otherwise, 33% of patients had other lesions around the bronchovascular bundle.
- The other CT features included air bronchogram (57%), vascular enlargement (67%), interlobular septal thickening (62%), and pleural effusions (19%).
- Compared with that in the group with positive initial RT-PCR results, CT of the group with negative initial RT-PCR results was less likely to show pulmonary consolidation.

Conclusively, The less pulmonary consolidation found at CT, the greater is the possibility of negative initial RT-PCR results. Chest CT is important in the screening of patients in whom disease is clinically suspected, especially those who have negative initial RT-PCR results.

Source: https://www.ajronline.org/doi/10.2214/AJR.20.23012
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