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Categorisation of thyroid FNAs with likelihood of malignancy (LOM) (RCPath and BSCC guidelines)
| Thy 1 | Non-diagnostic for cytological diagnosis | LOM 0–10% |
| Thy 1c | Non-diagnostic for cytological diagnosis – cystic lesion | |
| Thy 2 | Non-neoplastic | LOM 0–3% |
| Thy 2c | Non-neoplastic, cystic lesion | |
| Thy 3a | Neoplasm possible – atypia/non-diagnostic | LOM 5–15% |
| Thy 3f | Neoplasm possible, suggesting follicular neoplasm | LOM 15–30% |
| Thy 4 | Suspicious of malignancy | LOM 60–75% |
| Thy 5 | Malignant | LOM 97–100% |
