Introduction: Diabetes mellitus and thyroid disorders are the most common endocrinal disorders seen in clinical practice. The presence of undetected thyroid dysfunction may affect glycemic control in diabetics.

The aim of the present study was to evaluate the thyroid functions tests in patients with type 2 diabetes mellitus (T2DM). Materials &methods: In this retrospective study we included diabetic patients who performed thyroid function tests i.e. free tri–iodothyronine (FT3), free thyroxine (FT4) and thyroid stimulating hormone (TSH) and the thyroid dysfunction was stratified as hypothyroidism, subclinical hypothyroidism, hyperthyroidism, subclinical hyperthyroidism with reference to hormonal levels. Results: Prevalence of thyroid dysfunction in T2DM patients increases with age. Prevalence is higher if the patient has uncontrolled T2DM.  Hypothyroidism is present 3.8% of diabetics and subclinical hypothyroidism is present in18.8%  of diabetics. Hyperthyroidism is present in 61 % of  diabetics and  subclinical hyperthyroidism is present in 13.4 % of  diabetics .Of the diabetic groups 3% were euthyroid. Conclusions: Greater the duration of uncontrolled T2DM in a patient, higher is the chance of thyroid dysfunction. Females and advanced aged patients are more vulnerable to thyroid dysfunction. These data reinforce that diabetes patients with thyroid comorbidity need more endocrine attention.HbA1c can be used as a test to decide if screening for thyroid dysfunction is needed in T2DM patients or not.