Diagnostic performance comparison between FNA alone and the combination of FNA with FNA-Tg.

Data in parentheses are 95% confidence intervals.aCutoff value of FNA-Tg was 19.9 ng/mL.bCutoff value of FNA-Tg was 38.3 ng/mL.All, groups including sTgAb- and sTgAb+; sTgAb-, undetectable serum TgAbs; sTgAb+, detectable serum TgAbs; FNA, fine needle aspiration; FNA-Tg, thyroglobulin level in FNA washout fluid; PPV, positive predictive value; NPV, negative predictive value; AUC, the area under the ROC curves.Diagnostic performance comparison between FNA alone and the combination of FNA with FNA-Tg.