Thyroid Fine Needle Aspiration (FNA) and Cytology | 合法醫療器材資訊網

IndicationsforFNA·Age,<20or>40years·Nodulesize>2cmdiameter·Regionaladenopathy·Presenceofdistantmetastases·Priorheadorneckirradiation.

All solitary or dominant nodules ≥ 1cm in diameter should be evaluated by FNA. FNA is preferred to thyroid scanning or ultrasonography as the initial diagnostic test for evaluating patients with thyroid nodules.[452[1]] Since FNA became popular in the 1970s, the number of thyroid surgical procedures has decreased by 50% whereas the percent yield of cancers for patients undergoing surgery for thyroid nodules has increased from 10-15% to 20-50%.[453[2]] The frequency of false negative FNA reports is related to the skill of the operator and the experience of the cytopathologist.[454[3]] False negative rates appear to be less than 2 %.[455[4]]

Guideline 56. Use of Fine Needle Aspiration (FNA) of the Thyroid

FNA is recommended for all palpable solitary or dominant nodules, independent of size.