Initial preferred investigation for thyroid nodule is:

Initial investigation done in STN is thyroid function test(TFT) Investigation of choice in STN for diagnosis is FNAC Solitary Thyroid Nodule: Initial investigation done in STN is thyroid function test (TFT) If TFT is raised, next investigation is thyroid scan , (For hot nodules, RAI ablation or surgery is done; For warm or cold nodules follow-up or surgery) If TFT is normal, USG is done (Aspiration in cystic lesion, FNAC for solid or heterogenous lesions) Investigationn of choice in STN for diagnosis is FNAC. Ref: Sabiston 20th edition Pgno: 890