K-tirads Calculator [portable] (Free · 2026)

Even with a calculator, errors can occur if the input is flawed. Here are the most common mistakes in K-TIRADS classification and how a well-designed calculator mitigates them:

| Feature | | ACR-TIRADS Calculator | | :--- | :--- | :--- | | Approach | Pattern-based (categorical) | Point-based (sum of scores) | | Features scored | High-risk pattern (3 features) | 5 features (composition, echogenicity, shape, margin, echogenic foci) | | Output | Category 1-4 (Malignancy risk brackets) | TR1 to TR5 (Points: 0 to ≥7) | | Ease of use | Faster (fewer inputs) | More granular (slower but systematic) | | Inter-observer variability | Higher without a calculator | Lower due to point system | | FNA thresholds | Based on category + size | Based on TR score + size | | Best for | High-volume centers with experienced thyroid imagers | General radiology practices; training environments |

For patients with multiple nodules, stratify each nodule independently. The highest-category nodule typically drives management, though additional nodules may be sampled based on clinical context.

The K-TIRADS Calculator is an essential, easy-to-use tool that brings standardized thyroid nodule assessment to the point of care, improving diagnostic confidence and patient management. k-tirads calculator

Neither is universally superior. Practices with dedicated thyroid radiologists often prefer K-TIRADS for speed. Generalists often prefer ACR-TIRADS for its explicit point tally. However, a K-TIRADS calculator bridges the gap, offering the speed of pattern recognition with the consistency of a point system.

| Category | FNA Size Threshold | Follow-Up Threshold | | :--- | :--- | :--- | | K-TIRADS 4 (High) | ≥ 1.0 cm | < 1.0 cm (consider repeat US in 12 mo) | | K-TIRADS 3 (Intermediate) | ≥ 1.5 cm | 1.0–1.49 cm (repeat US in 12–24 mo) | | K-TIRADS 2 (Low) | ≥ 2.0 cm | 1.5–1.99 cm (repeat US in 24 mo) | | K-TIRADS 1 (Benign) | No FNA | Incidental; no routine follow-up |

Solid hypoechoic nodules without suspicious features, OR nodules with any single suspicious feature. K-TIRADS 5 High Suspicion Even with a calculator, errors can occur if

Most calculators present a structured checklist rather than a free-text field. The inputs typically include:

: An interactive tool for predicting malignancy based on Korean Society of Thyroid Radiology (KSThR) features. Comparative Multi-TIRADS Calculator

Intermediate suspicion nodule (e.g., hypoechoic solid nodules without suspicious features) 15% – 50% High suspicion nodule (Solid hypoechoic nodule with ≥is greater than or equal to 1 suspicious feature) Biopsy (FNAB) Size Thresholds in K-TIRADS The K-TIRADS Calculator is an essential, easy-to-use tool

A 2021 study explicitly compared radiologists using free recall versus using a K-TIRADS calculator. The calculator group had:

Identify if the nodule is markedly hypoechoic, hypoechoic, or iso/hyperechoic.