# CO-RADS — COVID-19 Reporting and Data System

> Level of suspicion for pulmonary involvement of COVID-19 on chest CT.

**Situação:** vigente · **Órgão:** Tórax · **Órgão emissor:** Dutch Radiological Society · **Versão:** 2020 · **Ano:** 2020

## Procedência e vigência
- Família: léxico
- Tipo de lógica: flat
- Modalidade: CT
- Fonte primária: Prokop M, van Everdingen W, van Rees Vellinga T, et al.. CO-RADS: A Categorical CT Assessment Scheme for Patients Suspected of Having COVID-19 (2020) — https://doi.org/10.1148/radiol.2020201473
- Última verificação: 2026-06-26
- Última checagem: 2026-06-26

## Categorias

| Código | Rótulo | Critérios | Conduta | Risco | Localizador | Verificado |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | Very low suspicion | Very low level of suspicion for pulmonary involvement of COVID-19: either a normal CT or CT findings of an unequivocally non-infectious cause. Concomitant findings such as mild or severe emphysema, perifissural nodules, lung tumours or fibrosis are placed here. Equivalent to the RSNA 'negative for pneumonia' category. | — | Very low suspicion of COVID-19 pulmonary involvement. | Section 'CO-RADS 1' under 'CO-RADS, the COVID-19 Reporting and Data System' | ✓ |
| 2 | Low suspicion | Low level of suspicion: lung findings typical of an infectious cause considered not compatible with COVID-19 (e.g. bronchitis, infectious bronchiolitis, bronchopneumonia, lobar pneumonia, pulmonary abscess), with features such as tree-in-bud sign, centrilobular nodular pattern, lobar or segmental consolidation, and cavitation. Overlaps with the RSNA 'atypical appearance' category. | — | Low suspicion of COVID-19 pulmonary involvement. | Section 'CO-RADS 2' | ✓ |
| 3 | Equivocal | Equivocal/indeterminate level of suspicion: features that can also occur in other viral pneumonias or non-infectious causes, e.g. perihilar ground-glass, homogeneous extensive ground-glass (with or without sparing of some secondary lobules), ground-glass with smooth interlobular septal thickening with/without pleural effusion, small non-centrilobular ground-glass opacities not abutting the visceral pleura, and consolidation patterns compatible with organizing pneumonia, in the absence of other typical COVID-19 findings. | — | Equivocal/indeterminate suspicion of COVID-19 pulmonary involvement. | Section 'CO-RADS 3' | ✓ |
| 4 | High suspicion | High level of suspicion: findings typical for COVID-19 but with some overlap with other (viral) pneumonias. Findings resemble CO-RADS 5 but are not in contact with the visceral pleura, are strictly unilateral, are in a predominantly peribronchovascular distribution, or are superimposed on severe diffuse pre-existing lung abnormalities. Corresponds to the higher-likelihood part of the RSNA 'indeterminate appearance' category. | — | High suspicion of COVID-19 pulmonary involvement. | Section 'CO-RADS 4' | ✓ |
| 5 | Very high suspicion | Very high level of suspicion: typical CT findings, namely ground-glass opacities (with or without consolidation) located in lung regions close to the visceral pleural surfaces including the fissures, with a multifocal bilateral distribution; subpleural sparing may be present. At least one of the typical confirmatory features must be present (e.g. multifocal ground-glass with rounded/unsharp demarcation, crazy-paving with intralobular lines, increasing consolidation, reverse halo/organizing-pneumonia-like changes, subpleural curvilinear bands, thickened vessels within abnormalities). Largely identical to the RSNA 'typical appearance' category. | — | Very high suspicion of COVID-19 pulmonary involvement. | Section 'CO-RADS 5' and Table 2 ('Features typical for COVID-19') | ✓ |
| 6 | PCR proven | Proven COVID-19, indicated by a positive RT-PCR test for SARS-CoV-2 specific nucleic acid at the time of examination. Introduced analogously to BI-RADS 6. | — | Proven COVID-19 (RT-PCR positive). | Section 'CO-RADS 6' | ✓ |

### Citações por categoria
- **1**: Prokop M, van Everdingen W, van Rees Vellinga T, et al.. CO-RADS: A Categorical CT Assessment Scheme for Patients Suspected of Having COVID-19 (2020) — https://doi.org/10.1148/radiol.2020201473 · Section 'CO-RADS 1' under 'CO-RADS, the COVID-19 Reporting and Data System'
- **2**: Prokop M, van Everdingen W, van Rees Vellinga T, et al.. CO-RADS: A Categorical CT Assessment Scheme for Patients Suspected of Having COVID-19 (2020) — https://doi.org/10.1148/radiol.2020201473 · Section 'CO-RADS 2'
- **3**: Prokop M, van Everdingen W, van Rees Vellinga T, et al.. CO-RADS: A Categorical CT Assessment Scheme for Patients Suspected of Having COVID-19 (2020) — https://doi.org/10.1148/radiol.2020201473 · Section 'CO-RADS 3'
- **4**: Prokop M, van Everdingen W, van Rees Vellinga T, et al.. CO-RADS: A Categorical CT Assessment Scheme for Patients Suspected of Having COVID-19 (2020) — https://doi.org/10.1148/radiol.2020201473 · Section 'CO-RADS 4'
- **5**: Prokop M, van Everdingen W, van Rees Vellinga T, et al.. CO-RADS: A Categorical CT Assessment Scheme for Patients Suspected of Having COVID-19 (2020) — https://doi.org/10.1148/radiol.2020201473 · Section 'CO-RADS 5' and Table 2 ('Features typical for COVID-19')
- **6**: Prokop M, van Everdingen W, van Rees Vellinga T, et al.. CO-RADS: A Categorical CT Assessment Scheme for Patients Suspected of Having COVID-19 (2020) — https://doi.org/10.1148/radiol.2020201473 · Section 'CO-RADS 6'

## Histórico de versões

| Data | Evento | Detalhe | Situação |
| --- | --- | --- | --- |
| 2020-04-27 | published | CO-RADS published in Radiology. | confirmed |


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> Conteúdo de referência reescrito. Confira a publicação primária vigente. Não é dispositivo médico nem substitui o julgamento clínico. O radiologista responsável pelo laudo permanece o autor e o responsável.

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