Abstract
Increased thyroid stimulating hormone (TSH) serum concentration can be a marker of subclinical hypothyroidism (SCH) or transient hyperthyrotropinemia. The aim of our study was to evaluate whether high serum TSH concentrations in allergic children could represent true SCH or isolated and transient hyperthyrotropinemia. We enrolled 620 allergic children (1.11-12.8 years) consecutively attending to our department. They were classified as atopics and non-atopics on the basis of the atopy work-up and, at baseline, they were investigated for thyroid function and low-grade inflammation state. Further, TSH was evaluated after 6 (T1) and 12 (T2) months. Both atopics and non-atopics showed higher SCH prevalence compared to controls (p=0.0055 and p=0.02, respectively), and a significant association between atopy and SCH (OR 10.11, 95% CI 1.36-75.12) was found. Both at T1 and T2, atopics had a significant risk of developing severe SCH compared to non-atopics (RR 1.8, 95% CI 1.39-2.34 and 1.61, 95% CI 1.21-2.14; respectively). Our data may suggest that hyperthyrotropinemia in atopic children could be used as a marker of true SCH.
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