<?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>1139-7632</journal-id>
<journal-title><![CDATA[Pediatría Atención Primaria]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Pediatr Aten Primaria]]></abbrev-journal-title>
<issn>1139-7632</issn>
<publisher>
<publisher-name><![CDATA[Asociación Española de Pediatría de Atención Primaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1139-76322022000100002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Pruebas diagnósticas en COVID-19: valoración crítica de la evidencia]]></article-title>
<article-title xml:lang="en"><![CDATA[Diagnostic tests in COVID-19: critical appraisal of the evidence]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Moneo Agapito]]></surname>
<given-names><![CDATA[Begoña]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A1b"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martín Masot]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivero Martín]]></surname>
<given-names><![CDATA[Mª José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3b"/>
</contrib>
</contrib-group>
<aff id="A1a">
<institution><![CDATA[,Hospital Universitario Infanta Leonor Servicio de Pediatría ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<aff id="A1b">
<institution><![CDATA[,Universidad Complutense de Madrid  ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Regional Universitario Servicio de Pediatría Sección de Gastroenterología y Nutrición Infantil]]></institution>
<addr-line><![CDATA[Málaga ]]></addr-line>
<country>España</country>
</aff>
<aff id="A3a">
<institution><![CDATA[,Hospital Universitario de Fuenlabrada Servicio de Pediatría ]]></institution>
<addr-line><![CDATA[Fuenlabrada Madrid]]></addr-line>
<country>España</country>
</aff>
<aff id="A3b">
<institution><![CDATA[,Universidad Rey Juan Carlos  ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,AEP y AEPap Grupo de Trabajo de Pediatría Basada en la Evidencia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<volume>24</volume>
<numero>93</numero>
<fpage>e1</fpage>
<lpage>e9</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S1139-76322022000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S1139-76322022000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S1139-76322022000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  durante la pandemia COVID-19 se han publicado multitud de estudios sobre pruebasb diagnósticas, orientados a determinar su precisión, el balance entre beneficios, riesgos, costes, equidad y factibilidad. Se presenta un resumen de las recomendaciones sobre las distintas pruebas disponibles y sobre las distintas características analíticas o radiológicas que pueden apoyar el diagnóstico o tener valor pronóstico.  Material y métodos:  se formularon preguntas PICO, se realizó una búsqueda sistemática de información, se evaluó y se sintetizó la información obtenida y se clasificó siguiendo la metodología GRADE. Finalmente se elaboraron tablas de evidencia con recomendaciones.  Resultados y discusión:  la reacción en cadena de la polimerasa con transcripción inversa se considera el patrón oro, siendo todas las marcas comerciales eficaces. Las muestras salivares presentan una validez similar a las nasofaríngeas, pudiendo ser una opción en contextos ambulatorios de baja prevalencia. Las pruebas antigénicas presentan menor sensibilidad y especificidad, aunque podrían ser consideradas en pacientes con síntomas de menos de cinco días de duración. Las pruebas serológicas son altamente específicos, ofreciendo mejores resultados tras 14 días del inicio y podrían ser de utilidad en casos de síndrome inflamatorio multisistémico. En casos moderados y graves se recomienda realizar analítica con LDH, proteína C reactiva, ferritina y procalcitonina, por el riesgo de coinfección. En estos pacientes, la ecografía a pie de cama podría ser una alternativa en caso de clínicos entrenados. La calidad de la evidencia es, en general, baja, y la mayoría de las recomendaciones presentan muy bajo grado de evidencia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  During the COVID-19 pandemic, many studies have been published on diagnostic tests, aimed at determining their accuracy, balance between benefits, risks, costs, fairness, and feasibility. A summary of the recommendations on the different tests available and on the different analytical or radiological characteristics that can support the diagnosis or have prognostic value is presented. .  Material and methods:  PICO questions were formulated and a systematic search for information was carried out. The information obtained was evaluated, synthesized, and classified following the GRADE methodology. Finally, evidence tables with recommendations were prepared.  Results and Discussion:  Reverse transcription polymerase chain reaction is considered the gold standard, all trademarks are effective. Salivary samples have similar validity to nasopharyngeal samples and may be an option in low-prevalence outpatient settings. Antigenic tests have lower sensitivity and specificity, although they could be considered in patients with symptoms lasting less than 5 days. Serological tests are highly specific, offering better results 14 days after onset and could be useful in cases of multisystem inflammatory syndrome. In moderate and severe cases, analysis with LDH, C-reactive protein, ferritin and procalcitonin is recommended, due to the risk of coinfection. In these patients, bedside point of care-ultrasound could be an alternative in the case of trained clinicians. The quality of the evidence is, in general, low and most of the recommendations present a very low degree of evidence.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[COVID-19]]></kwd>
<kwd lng="es"><![CDATA[Diagnóstico]]></kwd>
<kwd lng="es"><![CDATA[Reacción en cadena de la polimerasa]]></kwd>
<kwd lng="en"><![CDATA[COVID-19]]></kwd>
<kwd lng="en"><![CDATA[Diagnosis]]></kwd>
<kwd lng="en"><![CDATA[Reverse transcription polymerase chain reaction]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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