Relationship Serum Thyroid Stimulating Hormone with Body Mass Index in Patients with Thyroid Disorder

Hypothyroidism and hyperthyroidism have clear effects on body weight. In this study, we aimed to find the possible association between the serum thyroid stimulating hormone (TSH) and the body mass index (BMI). The weight, height and (TSH) were estimated for a total of (150) subjects whose ages ranged between (30–60) years during the period from March 2018 to July 2018. Participants were divided into three groups according to the BMI values: Normal weight (18.5–24.9Km/m²), overweight (25–29.9Km/m²) and obese (BMI ≥ 30Km/m²). The normal value for TSH was (0.25–5μIU/ml). Levels of serum thyroid hormones were assayed by Chemiluminescence immunoassay at the laboratory of Baghdad teaching hospital/Baghdad. A significant difference (P<0.001) was found in our study between TSH value and increased BMI. Subjects with higher (BMI) had also higher TSH, and this trend continued from normal weight to obese individuals. The mean (TSH) for normal subjects was (0.7093±0.384 mIU\L), for overweight was (0.7316±0.7309 mIU\L) and for obese was (1.2752±0.8258 mIU\L). The mean serum (TSH) concentrations demonstrated a significant increasing trend with the increasing (BMI) (p<0.01). It can be concluded from these findings that mean serum TSH levels increased with increased BMI values. To confirm the relationship between thyroid hormone levels and BMI, further large scale studies are required.