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Table 2 Triage of nodules for FNA or observation [1]

From: A practical trial to use Thyroid Imaging Reporting and Data System (TI-RADS) in differentiation between benign and malignant thyroid nodules

TI-RADS level Recommendations
TR1 No FNA required
TR2 No FNA required
TR3 Nodule size ≥ 1.5 cm: follow-up after 1, 3, and 5 years
Nodule size ≥ 2.5 cm: FNA is recommended
TR4 Nodule size ≥ 1.0 cm: follow-up after 1, 2, 3, and 5 years
Nodule size ≥ 1.5 cm: FNA is recommended
TR5 Nodule size ≥ 0.5 cm: annual follow-up for up to 5 years
Nodule size ≥1.0 cm: FNA is recommended