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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ketendo</journal-id><journal-title-group><journal-title xml:lang="ru">Клиническая и экспериментальная тиреоидология</journal-title><trans-title-group xml:lang="en"><trans-title>Clinical and experimental thyroidology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1995-5472</issn><issn pub-type="epub">2310-3787</issn><publisher><publisher-name>Endocrinology Research Centre</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.14341/ket20106335-41</article-id><article-id custom-type="elpub" pub-id-type="custom">ketendo-4281</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Циркадианная и индивидуальная вариабельность уровня ТТГ и тиреоидных гормонов у лиц с субклиническим гипотиреозом</article-title><trans-title-group xml:lang="en"><trans-title>Circadian and individual variability of TSH, fT4, fT3 in patients with subclinical hypothyroidism</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Sviridonova</surname><given-names>M A</given-names></name></name-alternatives><email xlink:type="simple">-</email></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Fadeyev</surname><given-names>V V</given-names></name></name-alternatives><email xlink:type="simple">walfad@mail.ru</email></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ilyin</surname><given-names>A V</given-names></name></name-alternatives><email xlink:type="simple">-</email></contrib></contrib-group><pub-date pub-type="collection"><year>2010</year></pub-date><pub-date pub-type="epub"><day>15</day><month>09</month><year>2010</year></pub-date><volume>6</volume><issue>3</issue><issue-title>ТОМ 6, №3 (2010)</issue-title><fpage>35</fpage><lpage>41</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Sviridonova M.A., Fadeyev V.V., Ilyin A.V., 2010</copyright-statement><copyright-year>2010</copyright-year><copyright-holder xml:lang="ru">Sviridonova M.A., Fadeyev V.V., Ilyin A.V.</copyright-holder><copyright-holder xml:lang="en">Sviridonova M.A., Fadeyev V.V., Ilyin A.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.cet-endojournals.ru/jour/article/view/4281">https://www.cet-endojournals.ru/jour/article/view/4281</self-uri><abstract><p>В ходе работы была изучена циркадианная и индивидуальная вариабельность уровней ТТГ, св. Т4, св. Т3 при субклиническом гипотиреозе. В исследование были включены 20 пациентов с ранее диагностированным СГ в возрасте 18-60 лет. Исследование уровней ТТГ, св. Т4 и св. Т3 проводилось в 8.00-9.00 и 14.00-16.00 ч одного дня, а также в 8.00-9.00 ч через 4–6 нед. Медиана уровня ТТГ в утренние часы составила 5,83 мЕд/л, в дневные – 3,79 мЕд/л. Диапазон суточных колебаний в процентном отношении достигал 73% (Ме – 28,5%). В соответствии с действующим референсным интервалом для уровня ТТГ 0,44 мЕд/л гипотиреоз в утренние часы определялся у 95% включенных в исследование лиц, а в дневные лишь у50%. В соответствии с предлагаемым референсным интервалом 0,4–2,5 мЕд/л в утренние часы гипотиреоз определялся у95% лиц, в дневные – у 80%. Уровни ТТГ через 4–6 нед отличались от исходных на (-66) – 139%. Статистически и клинически значимой вариабельности уровня св. Т4 выявлено не было. Вариабельность уровня св. Т3 оказалась статистически значимой и соответствовала колебаниям ТТГ. Вариабельность уровня ТТГ при субклиническом гипотиреозе крайне высока. Снижению клинической значимости циркадианных колебаний ТТГ может способствовать сужение действующего референсного интервала в дневные часы.</p></abstract><trans-abstract xml:lang="en"><p>To investigate circadian and individual variability of TSH, fТ4, fТ3 in patients with subclinical hypothyroidism (SH).20 patients with earlier diagnosed SH at the age of 18–60 years have been included. Measurements of serum TSH, fT4, fT3 were performed at 8.00–9.00 h and 14.00–16.00 during the day and at 8.00–9.00 h in 4–6 weeks. The median of TSH concentrations in the morning was 5,83 mU/l, at the daytime – 3.79 mU/l (р &lt; 0.05). The amplitude of TSH circadian variability reached 73% (Me – 28.5%). According to the current TSH reference ranges (0.4–4.0 mU/l) 95% participants in the morning and 50% participants at the day-time have been classified as having a hypothyroidism. According to the proposed TSH reference ranges (0.4–2.5 mU/l) 95% participants in the morning and 80% participants at the daytime have been classified as having a hypothyroidism. TSH levels in4–6 weeks differed from initial on (-66) – 139%. Statistically and clinically significant variability of fT4 has not beenfound. Variability of fТ3 has appeared statistically significant and correlation with TSH changes. Variability of TSH level in patients with SH is highest. Reduction of the clinical importance of TSH circadian rhythm can be promoted by narrowing TSH reference range at the daytime.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>ТТГ</kwd><kwd>св. Т4</kwd><kwd>св. Т3</kwd><kwd>референсный интервал</kwd><kwd>субклинический гипотиреоз</kwd><kwd>вариабельность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>TSH</kwd><kwd>fT4</kwd><kwd>fT3</kwd><kwd>variability</kwd><kwd>reference interval</kwd><kwd>subclinical hypothyroidism</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Свиридонова М.А., Фадеев В.В., Ильин А.В. Клинические аспекты циркадианной вариабельности уровня ТТГ // Клин. и эксперим. тиреоидол. 2009. №4. С. 38–41.</mixed-citation><mixed-citation xml:lang="en">Свиридонова М.А., Фадеев В.В., Ильин А.В. Клинические аспекты циркадианной вариабельности уровня ТТГ // Клин. и эксперим. тиреоидол. 2009. №4. С. 38–41.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Свиридонова М.А., Фадеев В.В. 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