Pulmonary Nodule Calculators
An incidental nodule and a screening nodule are not the same decision. These tools cover follow-up categories, malignancy probability, PET, and measured growth. Open the one that matches the setting and the data you actually have. Each page cites its own source and shows its own thresholds.
Educational reference for qualified professionals. Confirm the result against the source cited on the tool page and against local protocol.
Follow-up categories
Category systems tell you the next interval. They are not probability models, and a screening scheme should not be applied to a nodule found for another reason.
- Fleischner Incidental Pulmonary NodulesCalculator
Incidental solid and subsolid nodules in adults outside a screening program.
- Lung-RADS v2022 (Screening LDCT)Calculator
Lung cancer screening CT, coded as a screening examination rather than an incidental finding.
- BTS 2015 Pulmonary Nodule Guideline NavigatorCalculator
British Thoracic Society pathway, including when volumetry changes the recommendation.
- Incidental pulmonary nodule — characterisation and follow-upVetting
Whether another scan is the right next request, and which protocol.
- CT Chest — UnenhancedProtocol
Unenhanced chest CT, the usual acquisition when the question is the nodule itself.
- CT Chest — Low Dose Lung Cancer ScreeningProtocol
Low-dose chest CT, the acquisition a screening follow-up is actually performed with.
Probability and growth
Probability models need the inputs they were built on. A missing PET result is a reason to use a CT-only model, not to guess a Herder category. Growth is a measurement, not a risk score.
- Brock (PanCan) Pulmonary Nodule Malignancy RiskCalculator
Malignancy probability from clinical and CT features (PanCan / Brock).
- Mayo Clinic Solitary Pulmonary Nodule ModelCalculator
An older CT-based probability model, still what many reports name.
- Herder Model (Mayo + FDG-PET) for SPN Malignancy RiskCalculator
Adds FDG-PET avidity to a clinical probability. Needs the PET result.
- Nodule Volume Doubling Time (VDT)Calculator
Volume doubling time from two measurements. Use it when you have both dates and both sizes.
- Lung Cancer TNM Staging (9th Edition)Calculator
Staging, once the nodule is a cancer — not a tool for deciding if it is one.
Questions these pages get
Fleischner or Lung-RADS?
Fleischner is for an incidental nodule found outside screening. Lung-RADS is for a screening CT. Using one in the other setting produces a recommendation the source did not write. Both calculators are linked above so the setting can be matched before the category is.
Brock, Mayo, or Herder?
Brock and Mayo estimate probability from clinical and CT features. Herder is the step that folds in FDG-PET, so it is the wrong page when there is no PET. Volume doubling time does not estimate probability at all — it describes growth between two scans.