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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">ymj</journal-id><journal-title-group><journal-title xml:lang="ru">Якутский медицинский журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Yakut Medical Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1813-1905</issn><issn pub-type="epub">2312-1017</issn><publisher><publisher-name>ЯНЦ КМП</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25789/YMJ.2024.86.14</article-id><article-id custom-type="elpub" pub-id-type="custom">ymj-282</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>АКТУАЛЬНАЯ ТЕМА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ACTUAL TOPIC</subject></subj-group></article-categories><title-group><article-title>Эритропоэтин как предиктор крайне тяжелого течения новой коронавирусной инфекции COVID-19 у беременных женщин</article-title><trans-title-group xml:lang="en"><trans-title>Erythropoetin as a predictor of extremely severe course of new coronavirus infection COVID-19 in pregnant women</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9405-0134</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ищенко</surname><given-names>Л. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Ishchenko</surname><given-names>L. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ищенко Людмила Станиславовна – к.м.н., доцент ФГБОУ ВО «Южно-Уральский государственный медицинский университет» Минздрава России, врач акушер-гинеколог ГБУЗ «ОКБ №2».</p><p>Челябинск</p></bio><bio xml:lang="en"><p>Ishchenko Lyudmila Stanislavovna – PhD in Medical Sciences, Associate Professor of the Department of obstetrics and gynecology of South Ural State Medical University of the Ministry of Health of the Russian Federation (MH RF), obstetrician-gynecologist Regional Clinical Hospital No. 2</p></bio><email xlink:type="simple">lyudalyn@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/0000-0002-9055-102X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Воропаева</surname><given-names>Е. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Voropaeva</surname><given-names>E. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Воропаева Екатерина Евгеньевна – д.м.н., проф. ФГБОУ ВО «Южно-Уральский государственный медицинский университет» Минздрава России, зам. главного врача по акушерству и гинекологии ГБУЗ «ОКБ №2»</p><p>Челябинск</p></bio><bio xml:lang="en"><p>Voropaeva Ekaterina Evgenievna – MD, Professor, Professor of the Department of pathological anatomy and forensic medicine of South Ural State Medical University MH RF, Deputy Chief Physician for Obstetrics and Gynecology, Regional Clinical Hospital No. 2</p></bio><email xlink:type="simple">katya_voropaeva@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/0000-0002-1672-7058</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Казачкова</surname><given-names>Э. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kazachkova</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Казачкова Элла Алексеевна – д.м.н., проф.</p><p>Челябинск</p></bio><bio xml:lang="en"><p>Kazachkova Ella Alekseevna – MD, Professor, Professor of the Department of Obstetrics and Gynecology</p></bio><email xlink:type="simple">doctorkel@narod.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4512-3421</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Казачков</surname><given-names>Е. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Kazachkov</surname><given-names>E. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Казачков Евгений Леонидович – д.м.н., проф., зав. Кафедрой</p><p>Челябинск</p></bio><bio xml:lang="en"><p>Kazachkov Evgeny Leonidovich – MD, Professor, Head of the Department of Pathological Anatomy and Forensic Medicine</p></bio><email xlink:type="simple">doctorkel@narod.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6327-2685</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шамаева</surname><given-names>Т. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Shamaeva</surname><given-names>T. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шамаева Татьяна Николаевна – к.п.н., доцент</p><p>Челябинск</p></bio><bio xml:lang="en"><p>Shamaeva Tatiana Nikolaevna – PhD in Pedagogical Sciences, Associate Professor of the Department of Mathematics, Medical Informatics, Computer Science and Statistics, Physics of South Ural State Medical University MH RF</p></bio><email xlink:type="simple">shamtan@rambler.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1642-6607</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ищенко</surname><given-names>Ю. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Ishchenko</surname><given-names>Y. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ищенко Юлия Сергеевна – студент 4 курса</p><p>Челябинск</p></bio><bio xml:lang="en"><p>IShchenko Yulia Sergeevna – 4rd year student, Faculty of Pediatrics</p></bio><email xlink:type="simple">ischenkous0407@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">ФГБОУ ВО «Южно-Уральский государственный медицинский университет» Минздрава России; ГБУЗ «Областная клиническая больница №2»<country>Россия</country></aff><aff xml:lang="en">South Ural State Medical University MH RF; Regional Clinical Hospital No. 2<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">ФГБОУ ВО «Южно-Уральский государственный медицинский университет» Минздрава России<country>Россия</country></aff><aff xml:lang="en">South Ural State Medical University MH RF<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru">ФГБОУ ВО «Южно-Уральский государственный медицинский университет» Минздрава России<country>Россия</country></aff><aff xml:lang="en">Federal State Budgetary Educational Institution of the South Ural State Medical University MH RF<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>06</day><month>02</month><year>2025</year></pub-date><volume>0</volume><issue>2</issue><fpage>59</fpage><lpage>63</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ищенко Л.С., Воропаева Е.Е., Казачкова Э.А., Казачков Е.Л., Шамаева Т.Н., Ищенко Ю.С., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Ищенко Л.С., Воропаева Е.Е., Казачкова Э.А., Казачков Е.Л., Шамаева Т.Н., Ищенко Ю.С.</copyright-holder><copyright-holder xml:lang="en">Ishchenko L.S., Voropaeva E.E., Kazachkova E.A., Kazachkov E.L., Shamaeva T.N., Ishchenko Y.S.</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://ymj.elpub.ru/jour/article/view/282">https://ymj.elpub.ru/jour/article/view/282</self-uri><abstract><p>Проведен сравнительный анализ медико-социальных, клинико-лабораторных показателей у беременных женщин с новой коронавирусной инфекцией (НКВИ) COVID-19 различной степени тяжести. Впервые был изучен уровень эритропоэтина сыворотки крови у этой категории пациентов, выявлен статистически значимо более низкий уровень эритропоэтина у беременных женщин с крайне тяжелым течением COVID-19. Определено пороговое значение уровня эритропоэтина сыворотки крови для прогнозирования развития крайне тяжелого течения COVID-19 у беременных женщин.</p></abstract><trans-abstract xml:lang="en"><p>A comparative analysis of medical, social, clinical and laboratory parameters in pregnant women with a new coronavirus infection (NCI) COVID-19 of varying severity was carried out. For the first time, the level of serum erythropoietin was studied in this category of patients; for the first time, a statistically significantly lower level of erythropoietin was detected in pregnant women with extremely severe COVID-19. The threshold value of serum erythropoietin level was determined to predict the development of extremely severe COVID-19 in pregnant women.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>новая коронавирусная инфекция</kwd><kwd>COVID-19</kwd><kwd>беременность</kwd><kwd>крайне тяжелое течение</kwd><kwd>эритропоэтин сыворотки крови</kwd></kwd-group><kwd-group xml:lang="en"><kwd>new coronavirus infection</kwd><kwd>COVID-19</kwd><kwd>pregnancy</kwd><kwd>extremely severe course</kwd><kwd>serum erythropoietin</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">Благоприятный исход крайне тяжелого течения новой коронавирусной инфекции COVID-19 при беременности с тотальным поражением легких, острым миокардитом и инфарктом миокарда / Е.Е. Воропаева [и др.] // Акушерство и гинекология. 2021. №10. С. 179-186. DOI: 10.18565/aig.2021.10.179-186.</mixed-citation><mixed-citation xml:lang="en">Favorable outcome of the extremely severe course of the new coronavirus infection COVID-19 during pregnancy in the presence of overall lung damage, acute myocarditis, and myocardial infarction / E.E. Voropaeva [et al.] // Obstetrics and Gynecology. 2021. №10. P. 179-186. DOI: 10.18565/aig.2021.10.179-186.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Временные методические рекомендации. Профилактика, диагностика и лечение новой коронавирусной инфекции (COVID-19). Версия 18 (26.10.2023) [Интернет]. URL: https://static0.minzdrav.gov.ru/system/attachments/attaches/000/064/610/original/ВМР_COVID-19_V18.pdf 18 (26.10.2023) [Internet]. URL: https://static0.minzdrav.gov.ru/system/attachments/attaches/000/064/610/original/ВМР_COVID-19_V18.pdf</mixed-citation><mixed-citation xml:lang="en">Temporary methodological recommendations. Prevention, diagnosis and treatment of new coronavirus infection (COVID-19). Version 18 (26.10.2023) [Internet]. URL: https://static0.minzdrav.gov.ru/system/attachments/attaches/000/064/610/original/ВМР_COVID-19_V18.pdf</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Захаров Ю.М. Неэритропоэтические функции эритропоэтина // Российский физиологический журнал им. И.М. Сеченова. 2007. Т.93, №6. С. 592-608.</mixed-citation><mixed-citation xml:lang="en">Zakharov Yu.М. Non-erythropoietic properties of erythropoietin // Russian Journal of Physiology. 2007. Vol.93, №6. P. 592-608.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Итоговое заявление о работе пятнадцатого совещания Комитета Международных медико-санитарных правил (2005 г.) по чрезвычайной ситуации в связи с пандемией [Интернет]. URL: https://www.who.int/ru/news/item/05-05-2023-statement-on-the-fifteenth-meeting-of-the-international-health-regulations-(2005)-emergency-committee-regarding-the-coronavirus-disease-(covid-19)-pandemic</mixed-citation><mixed-citation xml:lang="en">Final statement on the work of the fifteenth meeting of the International Health Regulations Committee (2005) on the pandemic emergency [Internet]. URL: https://www.who.int/ru/news/item/05-05-2023-statement-on-the-fifteenth-meeting-of-the-international-health-regulations-(2005)-emergency-committee-regarding-the-coronavirus-disease-(covid-19)-pandemic5.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Лыков А.П. Эритропоэтин: функции и терапевтический потенциал // Сибирский научный медицинский журнал. 2023. Т.43, №3. С. 29-39. DOI: 10.18699/SSMJ20230203</mixed-citation><mixed-citation xml:lang="en">Lykov A.P. Erythropoietin: function and therapeutic potential // Siberian scientific medical journal. 2023. Vol.43, №3. P. 29-39. DOI: 10.18699/sSMJ20230203.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Морфофункциональная характеристика эритроцитов и уровень эритропоэтина в крови у пациентов как предикторы тяжелого течения COVID-19 / В.В. Ревин [и др.] // Бюллетень экспериментальной биологии и медицины. 2022. Т.173, №1. С. 57-61. DOI: 10.47056/0365-9615-2022-173-1-57-61.</mixed-citation><mixed-citation xml:lang="en">Morphofunctional characteristics of erythrocytes and blood erythropoietin level in patients as predictors of severe course of COVID-19 / V.V. Revin [et al.] // Bulletin of Experimental Biology and Medicine. 2022. Vol.173, №1. P. 57-61. DOI: 10.47056/0365-9615-2022-173-1-57-61.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Опыт ведения беременных с тяжелой и крайне тяжелой формами COVID-19 / А.И. Гареева [и др.] // Журнал акушерства и женских болезней. 2022. Т.71, №1. С. 11-22. DOI: 10.17816/JOWD72169.</mixed-citation><mixed-citation xml:lang="en">Experience in managing severe and extremely severe COVID-19 in pregnant women / A.I. Gareyeva [et al.] // Journal of Obstetrics and Women's Diseases. 2022. Vol.71, №1. P. 11-22. DOI: 10.17816/JOWD72169.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Особенности гемостаза у беременных женщин при манифестации новой коронавирусной инфекции COVID-19 в третьем триместре гестации / Л.С. Ищенко [и др.] // ЮжноУральский медицинский журнал. 2021. №3. С. 60-74.</mixed-citation><mixed-citation xml:lang="en">Peculiarities of hemostasis in pregnant women during manifestation of new coronavirus infection COVID-19 in the third trimester of gestation / L.S. Ishchenko [et al.] //south Ural medical journal. 2021. №3. P. 60-74.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Реабилитация в условиях пандемии COVID-19 / А.С. Голота [и др.] // Клиническая практика. 2022. Т.13, №1. С. 42-65. DOI: 10.17816/clinpract79364.</mixed-citation><mixed-citation xml:lang="en">Rehabilitation during the COVID-19 pandemic / A.S. Golota [et al.] // Clinical Practice. 2022. Vol.13, №1. P. 42-65. DOI: 10.17816/clinpract79364.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">COVID-19 у беременных Сибири и Дальнего Востока: итоги 2 лет пандемии / Т.Е. Белокриницкая [и др.] // Акушерство и гинекология. 2022. №4. С. 47-54. DOI: 10.18565/aig.2022.4.47-54.</mixed-citation><mixed-citation xml:lang="en">COVID-19 in pregnant women of Siberia and the Russian Far East: 2-year results of the pandemic / T.E. Belokrinitskaya [et al.] // Obstetrics and Gynecology. 2022. №4. С. 47-54. DOI: 10.18565/aig.2022.4.47-54.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Частота и исходы экстремально ранних преждевременных родов у беременных женщин с новой коронавирусной инфекцией COVID-19 / Л.С. Ищенко [и др.] // Якутский медицинский журнал. 2023. №1. С. 80-83. DOI: 10.25789/YMJ.2023.81.20.</mixed-citation><mixed-citation xml:lang="en">Frequency and outcomes of extremely early preterm birth in pregnant women with new coronavirus infection COVID-19 / L.S. Ishchenko [et al.] // Yakut Medical Journal. 2023. №1. P. 80-83. DOI: 10.25789/YMJ.2023.81.20.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Erythropoietin and hypoxia increase erythropoietin receptor and nitric oxide levels in lung microvascular endothelial cells / B.B. Beleslin-Čokić [et al.] // Cytokine. 2011; 54(2): 129-35. DOI: 10.1016/j.cyto.2011.01.015.</mixed-citation><mixed-citation xml:lang="en">Erythropoietin and hypoxia increase erythropoietin receptor and nitric oxide levels in lung microvascular endothelial cells / B.B. Beleslin-Čokić [et al.] // Cytokine. 2011; 54(2): 129-35. DOI: 10.1016/j.cyto.2011.01.015.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Broxmeyer H.E. Erythropoietin surprises: an immune saga // Immunity. 2011; 34(1): 6-7. DOI: 10.1016/j.immuni.2011.01.004.</mixed-citation><mixed-citation xml:lang="en">Broxmeyer H.E. Erythropoietin surprises: an immune saga // Immunity. 2011; 34(1): 6-7. DOI: 10.1016/j.immuni.2011.01.004.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Erythropoietin protects against diabetes through direct effects on pancreatic beta cells / D. Choi [et al.] // J Exp Med. 2010; 207(13): 28312842. DOI: 10.1084/jem.20100665.</mixed-citation><mixed-citation xml:lang="en">Erythropoietin protects against diabetes through direct effects on pancreatic beta cells / D. Choi [et al.] // J Exp Med. 2010; 207(13): 28312842. DOI: 10.1084/jem.20100665.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Clinical characteristics andoutcomes of pregnant women with COVID-19 and comparison with control patients: A systematic review and meta-analysis / M. Jafari [et al.] // Rev Med Virol. 2021; 31(5): 1-16. DOI: 10.1002/rmv.2208.</mixed-citation><mixed-citation xml:lang="en">Clinical characteristics andoutcomes of pregnant women with COVID-19 and comparison with control patients: A systematic review and meta-analysis / M. Jafari [et al.] // Rev Med Virol. 2021; 31(5): 1-16. DOI: 10.1002/rmv.2208.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Elevated D-dimer levels on admission are associated with severity and increased risk of mortality in COVID-19: A systematic review and meta-analysis / B. Gungor [et al.] // Am J Emerg Med. 2021; 39: 173-179. DOI:10.1016/j.ajem.2020.09.018.</mixed-citation><mixed-citation xml:lang="en">Elevated D-dimer levels on admission are associated with severity and increased risk of mortality in COVID-19: A systematic review and meta-analysis / B. Gungor [et al.] // Am J Emerg Med. 2021; 39: 173-179. DOI:10.1016/j.ajem.2020.09.018.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Pregnancy and Perinatal Outcomes of Women With Coronavirus Disease (COVID-19) Pneumonia: A Preliminary Analysis / D. Liu [et al.] // AJR Am J Roentgenol. 2020; 215(1): 127-132. DOI: 10.2214/AJR.20.23072.</mixed-citation><mixed-citation xml:lang="en">Pregnancy and Perinatal Outcomes of Women With Coronavirus Disease (COVID-19) Pneumonia: A Preliminary Analysis / D. Liu [et al.] // AJR Am J Roentgenol. 2020; 215(1): 127-132. DOI: 10.2214/AJR.20.23072.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Clinical characteristics, prognostic factors, and maternal and neonatal outcomes of SARS-CoV-2 infection among hospitalized pregnant women: A systematic review / O. Turan [et al.] // Int J Gynecol Obstet. 2020; 151(1): 7-16. DOI: 10.1002/ijgo.13329ijgo.13329.</mixed-citation><mixed-citation xml:lang="en">Clinical characteristics, prognostic factors, and maternal and neonatal outcomes of SARS-CoV-2 infection among hospitalized pregnant women: A systematic review / O. Turan [et al.] // Int J Gynecol Obstet. 2020; 151(1): 7-16. DOI: 10.1002/ijgo.13329ijgo.13329.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Vallejo V., Ilagan J.G. A Postpartum Death Due to Coronavirus Disease 2019 (COVID-19) in the United States // Obstet Gynecol. 2020; 136(1): 52-55. DOI: 10.1097/AOG.0000000000003950.</mixed-citation><mixed-citation xml:lang="en">Vallejo V., Ilagan J.G. A Postpartum Death Due to Coronavirus Disease 2019 (COVID-19) in the United States // Obstet Gynecol. 2020; 136(1): 52-55. DOI: 10.1097/AOG.0000000000003950.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Low serum erythropoietin levels are associated with fatal COVID-19 cases at 4,150 meters above sea level / A. Viruez-Soto [et al.] // Respir Physiol Neurobiol. 2021; 292(103709): 1-5. DOI: 10.1016/j.resp.2021.103709.</mixed-citation><mixed-citation xml:lang="en">Low serum erythropoietin levels are associated with fatal COVID-19 cases at 4,150 meters above sea level / A. Viruez-Soto [et al.] // Respir Physiol Neurobiol. 2021; 292(103709): 1-5. DOI: 10.1016/j.resp.2021.103709.</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">The relationship between serum erythropoietin, hepcidin, and haptoglobin levels with disease severity and other biochemical values in patients with COVID-19 /s. Yağcı [et al.] // Int J Lab Hematol. 2021; 43 (Suppl 1): 142-151. DOI: 10.1111/ijlh.13479.</mixed-citation><mixed-citation xml:lang="en">The relationship between serum erythropoietin, hepcidin, and haptoglobin levels with disease severity and other biochemical values in patients with COVID-19 /s. Yağcı [et al.] // Int J Lab Hematol. 2021; 43 (Suppl 1): 142-151. DOI: 10.1111/ijlh.13479.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
