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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">porozendo</journal-id><journal-title-group><journal-title xml:lang="ru">Остеопороз и остеопатии</journal-title><trans-title-group xml:lang="en"><trans-title>Osteoporosis and Bone Diseases</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2072-2680</issn><issn pub-type="epub">2311-0716</issn><publisher><publisher-name>Endocrinology Research Centre</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.14341/osteo13177</article-id><article-id custom-type="elpub" pub-id-type="custom">porozendo-13177</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>КЛИНИЧЕСКИЕ СЛУЧАИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CASE REPORTS</subject></subj-group></article-categories><title-group><article-title>Семейная гипокальциурическая гиперкальциемия: Представление клинического случая</article-title><trans-title-group xml:lang="en"><trans-title>Familial hypocalciuric hypercalciemia: clinical case report</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1932-1686</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Судницына</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Sudnitsyna</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Судницына Анна Сергеевна - к.м.н.</p><p>625000, Тюмень, ул. Одесская, 54</p></bio><bio xml:lang="en"><p>Anna S. Sudnitsyna - MD, PhD.</p><p>54 Odesskaya street, 625000 Tyumen</p></bio><email xlink:type="simple">dr.sudnitsyna@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0008-0110-5708</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ляпунова</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Lyapunova</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ляпунова Анастасия Игоревна - клинический ординатор.</p><p>Тюмень</p></bio><bio xml:lang="en"><p>Anastasia I. Lyapunova - postgraduate student.</p><p>Tyumen</p></bio><email xlink:type="simple">dr_lyapunova@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9253-8075</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Суплотова</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Suplotova</surname><given-names>L. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Суплотова Людмила Александровна - д.м.н., профессор.</p><p>Тюмень</p></bio><bio xml:lang="en"><p>Lyudmila A. Suplotova - MD, PhD, Professor.</p><p>Tyumen</p></bio><email xlink:type="simple">suplotovala@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">ФГБОУ ВО «Тюменский государственный медицинский университет» МЗ РФ<country>Россия</country></aff><aff xml:lang="en">Tyumen state medical university<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>12</day><month>11</month><year>2024</year></pub-date><volume>27</volume><issue>4</issue><fpage>25</fpage><lpage>30</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Судницына А.С., Ляпунова А.И., Суплотова Л.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Судницына А.С., Ляпунова А.И., Суплотова Л.А.</copyright-holder><copyright-holder xml:lang="en">Sudnitsyna A.S., Lyapunova A.I., Suplotova L.A.</copyright-holder><license 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.osteo-endojournals.ru/jour/article/view/13177">https://www.osteo-endojournals.ru/jour/article/view/13177</self-uri><abstract><p>Гиперкальциемия — это синдром, подтвержденный лабораторно при повышении уровня кальция крови выше 2,55 ммоль/л. Ряд авторов утверждает, что наиболее частыми причинами гиперкальциемии являются злокачественные новообразования, первичный гиперпаратиреоз (ПГТП), интоксикация витамином D, хроническая болезнь почек (ХБП). Одной из наиболее редких причин, которые следует учитывать у пациентов с впервые диагностированной гиперкальциемией, является синдром семейной гипокальциурической гиперкальциемии (СГГ). СГГ является генетическим аутосомно-доминантым заболеванием, характеризующимся сниженным уровнем кальция мочи и повышенным уровнем кальция крови в сочетании с нормальным или превышающим референсные значения уровнем ПТГ. Представленный случай демонстрирует необходимость выполнения дифференциальной диагностики синдрома гиперкальциемии, важность расчета отношения почечного клиренса кальция к клиренсу креатинина, что в настоящее время является самым доступным методом и позволяет избежать необоснованного выполнения паратиреоидэктомии.</p></abstract><trans-abstract xml:lang="en"><p>Hypercalcemia is a laboratory-confirmed syndrome with an increase in blood calcium levels above 2.55 mmol/l. A number of authors claim that the most common causes of hypercalcemia are malignant neoplasms, primary hyperparathyroidism (PHPT), vitamin D intoxication, and chronic kidney disease. One of the rarest causes to consider in patients with newly diagnosed hypercalcemia is familial hypocalciuric hypercalcemia syndrome (FHH). FHH is a genetic autosomal dominant disorder characterized by decreased urinary calcium levels and increased blood calcium levels in combination with normal or above-reference PTH levels. The presented case demonstrates the need to perform a differential diagnosis of hypercalcemia syndrome, the importance of calculating the ratio of renal calcium clearance to creatinine clearance, which is currently the most accessible method and allows one to avoid unjustified parathyroidectomy.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гиперкальциемия</kwd><kwd>семейная гипокальциурическая гиперкальциемия</kwd><kwd>гиперпаратиреоз</kwd><kwd>клинический случай</kwd></kwd-group><kwd-group xml:lang="en"><kwd>hypercalcemia</kwd><kwd>familial hypocalciuric hypercalcemia</kwd><kwd>hyperparathyroidism</kwd><kwd>case report</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Благодарим сотрудников лаборатории общей, молекулярной и популяционной генетики ФГБУ «НМИЦ эндокринологии» (зав. лабораторией д.б.н., доцент Попов Сергей Владимирович) за проведение генетических исследований.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Демидова Т.Ю., Лобанова К.Г., Короткова Т.Н. 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