Large patient population suffers from non–specific signs and symptoms, thyroid dysfunction often remains an undiagnosed underlying abnormality. Clinically, diagnosing thyroid dysfunction can be extremely challenging since it has diverse manifestations. Our aim was to compare the efficacy of both the radiological modalities (USG and CT scan) in identifying subclinical thyroid dysfunction as determined by abnormality in serum TSH level. Present study was conducted in the department of Radiology in Command Hospital (EC), Kolkata, West Bengal. Total 200 patients were selected using above defined criteria. The study period was from Jan 2017 to Aug 2018. From this statistical analysis, we observed that out of the 16 SHypo cases, thyroid attenuation with NCCT picked up the maximum number of cases. Thyroid echogenicity compared with SMSG determined 10 cases (62.5%) & echogenicity compared with strap muscle can determine only 3 cases(18.7%). So thyroid echogenicity compared with SMSG has better sensitivity than strap neck muscles, though NCCT evaluation is more efficacious than USG.