<?xml version="1.0" encoding="ISO-8859-1"?><article 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">
<front>
<journal-meta>
<journal-id>2312-3893</journal-id>
<journal-title><![CDATA[Revista Virtual de la Sociedad Paraguaya de Medicina Interna]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. virtual Soc. Parag. Med. Int.]]></abbrev-journal-title>
<issn>2312-3893</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Paraguaya de Medicina Interna]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2312-38932026000100217</article-id>
<article-id pub-id-type="doi">10.18004/rvspmi/2312-3893/2026.e13122617</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Frecuencia de anticuerpos irregulares en donantes de sangre de un Centro Productor de Sangre de referencia del Paraguay entre los años 2020 al 2022]]></article-title>
<article-title xml:lang="en"><![CDATA[Frequency of irregular antibodies in blood donors at a reference blood production centre in Paraguay between 2020 and 2022]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz]]></surname>
<given-names><![CDATA[Jorge Willian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Ministerio de Salud Pública y Bienestar Social  ]]></institution>
<addr-line><![CDATA[Asunción ]]></addr-line>
<country>Paraguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2026</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2026</year>
</pub-date>
<volume>13</volume>
<numero>1</numero>
<fpage>217</fpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2312-38932026000100217&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2312-38932026000100217&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2312-38932026000100217&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción:  los anticuerpos irregulares son inmunoglobulinas que difieren de los anticuerpos naturales del sistema ABO de grupos sanguíneos. Surgen de la exposición a los antígenos de glóbulos rojos alogénicos durante una transfusión o el embarazo, u otro factor desencadenante que se desconozca. Estos anticuerpos reaccionan con antígenos específicos, son muy infrecuentes en donantes de sangre y pueden ser causantes de reacciones no deseadas graves por la incompatibilidad donante-receptor.  Objetivo:  determinar la frecuencia de anticuerpos irregulares en donantes de sangre de un centro productor de sangre.  Metodología:  se aplicó un diseño observacional, descriptivo, retrospectivo y de corte transversal. Se incluyó 51.860 donantes de sangre mayores de 18 años que acudieron al Centro Productor de Sangre y Terapia Celular del Instituto de Previsión Social, Hospital Central, Asunción, Paraguay, durante los años 2020, 2021 y 2022.  Resultados:  el grupo etario de donantes más frecuente fue de 31 a 35 años, predominaron los de sexo masculino (63,4%). La frecuencia de anticuerpos irregulares fue (0,49%) y predomino en las mujeres (72,1%).  Conclusión:  la frecuencia de anticuerpos irregulares fue muy baja, comparable a los reportados por otros países de la región. La determinación de los anticuerpos irregulares en los centros de producción de sangre sigue siendo primordial y necesario pese a su baja frecuencia, teniendo en cuenta que su presencia puede ser causal de complicaciones catastróficas en el receptor.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: Irregular antibodies are immunoglobulins that differ from the natural antibodies of the ABO blood group system. They arise from exposure to allogeneic red blood cell antigens during a transfusion or pregnancy, or another unknown triggering factor. These antibodies react with specific antigens, are very rare in blood donors, and can cause serious adverse reactions due to donor-recipient incompatibility.  Objective:  To determine the frequency of irregular antibodies in blood donors at a blood collection centre.  Methodology:  An observational, descriptive, retrospective, cross-sectional design was used. The study included 51,860 blood donors over the age of 18 who visited the Blood and Cell Therapy Production Centre of the Social Security Institute, Central Hospital, Asunción, Paraguay, during the years 2020, 2021, and 2022.  Results:  The most frequent age group of donors was 31 to 35 years old, with males predominating (63.4%). The frequency of irregular antibodies was 0.49%, with a predominance in women (72.1%).  Conclusion: The frequency of irregular antibodies was very low, comparable to that reported by other countries in the region. The determination of irregular antibodies in blood production centres remains essential and necessary despite their low frequency, given that their presence can cause catastrophic complications in the recipient.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[donantes de sangre]]></kwd>
<kwd lng="es"><![CDATA[anticuerpos]]></kwd>
<kwd lng="es"><![CDATA[reacción a la transfusión]]></kwd>
<kwd lng="es"><![CDATA[incompatibilidad de grupos sanguíneos]]></kwd>
<kwd lng="en"><![CDATA[blood donors]]></kwd>
<kwd lng="en"><![CDATA[antibodies]]></kwd>
<kwd lng="en"><![CDATA[transfusion reaction]]></kwd>
<kwd lng="en"><![CDATA[blood group incompatibility]]></kwd>
</kwd-group>
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