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Introduction: Diabetes is one of the most common metabolic diseases and one of its important complications is diabetic neuropathy. Due to the relationship between diabetes and thyroid disorders, the present study was performed to determine the association between subclinical hypothyroidism and end-stage diabetic polyneuropathy in patients with type 2 diabetes. Materials and Methods: In this descriptive, analytical study, 154 patients with type 2 diabetes referred to Kosar Hospital in Semnan were evaluated. After recording their demographic information, samples were received for biochemical testing. The patients’ neuropathy was then evaluated based on the United Kingdom screening test (UKST). The results were recorded in the data collection form and then analyzed using SPSS Statistics 22 software. Results: In this study, 154 patients were studied, including 49 with subclinical hypothyroidism and 105 with euthyroid. The results of the present study showed that the mean age of patients in the subclinical hypothyroid group was 60.08 years and in the euthyroid group was 60.77 years. Mean ± standard deviation (SD) of the patients’ age, blood pressure, duration of diabetes, body mass index, fasting blood sugar (FBS) and Glucose, and 2-hour post prandial (2HPP) were not statistically significant between the two groups. The frequency of neuropathy severity based on clinical signs during examination and symptoms mentioned by the patients in the two groups was statistically significant ( P = 0.005 and P = 0.001, respectively). The severity of neuropathy was not significantly associated with thyroid-stimulating hormone (TSH) levels ( P > 0.05). Conclusion: From the results of the present study, it can be concluded that the severity of neuropathy based on the clinical signs during examination and the symptoms mentioned by the patient in diabetic patients is related to subclinical hypothyroidism. Further studies are recommended.

Introduction: Studies have shown the association between subclinical hypothyroidism and type 2 diabetes. However, the common complications of type 2 diabetes, such as diabetic nephropathy and albuminuria with subclinical hypothyroidism, are not fully clear yet. This study thus aimed to determine the association between subclinical hypothyroidism and albuminuria in patients with type 2 diabetes mellitus. Methods: This was a cross-sectional study, of 140 individuals diagnosed with type 2 diabetes mellitus (DM) admitted to the internal clinics of Kosar Hospital in Semnan, Iran in 2017-2018. The participants were selected, and were compared based on having 2 TSH levels above normal (>4.2 mIU/L) 3 months apart, as well as patients were divided to two groups including, subclinical hypothyroidism group (n=40) and euthyroid group (n=100) based on demographic information, laboratory information and indicators such as albuminuria, and urinary albumin-to-creatinine ratio (UACR). Findings: The mean and standard deviation of UACR in patients with subclinical hypothyroidism were significantly higher than those of euthyroid patients (46.09 ± 27 9.27 vs. 3.94 ± 0.24 and P = 0.015, respectively). In patients with subclinical hypothyroidism, there was a statistically significant and direct relationship between UACR values with primary TSH level (r = 0.555, P< 0.001) and UACR values with secondary TSH level (r = 0.563, P< 0.001). Conclusion: Among type 2 DM patients, the rate of albuminuria in subclinical hypothyroidism group was significantly higher than that of euthyroid patients and with increasing initial and recurrent TSH levels, UACR values and consequently albuminuria increased.

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