Table 2.
NELSON management protocol for non-calcified pulmonary nodules in the different screening rounds
| Year 1 | Year 2 | Year 4 | Year 6 | |
|---|---|---|---|---|
| NODCAT 1 | Negative test | Negative test | Negative test | Negative test |
| Annual CT | CT in year 4 | CT in year 6 | End of screening | |
| NODCAT 2 | Negative test | Indeterminate test | Indeterminate test | Indeterminate test |
| Annual CT | CT after 1 year | CT after 1 year | End of screening | |
| NODCAT 3 | Indeterminate test | Indeterminate test | Indeterminate test | Indeterminate test |
| 3 months follow-up CT | CT after 6–8 weeks | CT after 6–8 weeks | CT after 6–8 weeks | |
| NODCAT 4 | Positive test | Positive test | Positive test | Positive test |
| Refer to pulmonologist for work-up and diagnosis | Refer to pulmonologist for work-up and diagnosis | Refer to pulmonologist for work-up and diagnosis | Refer to pulmonologist for work-up and diagnosis | |
| GROWCAT A | Negative test | Negative test | Negative test | Negative test |
| CT in year 2 | CT in year 4 | CT in year 6 | End of screening | |
| GROWCAT B | Negative test | Indeterminate test | Indeterminate test | Indeterminate test |
| CT in year 2 | CT after 1 year | CT after 1 year | CT after 1 year | |
| GROWCAT C | Positive test | Positive test | Positive test | Positive test |
| Refer to pulmonologist for work-up and diagnosis | Refer to pulmonologist for work-up and diagnosis | Refer to pulmonologist for work-up and diagnosis | Refer to pulmonologist for work-up and diagnosis |