<?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>0035-0052</journal-id>
<journal-title><![CDATA[Revista mexicana de pediatría]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. pediatr.]]></abbrev-journal-title>
<issn>0035-0052</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Pediatría A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-00522019000600223</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Niveles normales del marcador lipocalina asociada con gelatinasa de neutrófilo (NGAL) en orina en recién nacidos pretérmino y de término a las 24 y 72 horas de vida]]></article-title>
<article-title xml:lang="en"><![CDATA[Normal levels of urine neutrophil gelatinase-associated lipocalin (u-NGAL) in pre-term and term newborns at 24 and 72 hours of life]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Plascencia-Pimentel]]></surname>
<given-names><![CDATA[Karen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bernárdez-Zapata]]></surname>
<given-names><![CDATA[Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gerardo-Del Hoyo]]></surname>
<given-names><![CDATA[Moisés Noé]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Iglesias-Leboreiro]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rendón-Macías]]></surname>
<given-names><![CDATA[Mario Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romo-Vázquez]]></surname>
<given-names><![CDATA[José Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vicencio-Rivas]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lozano-Duau]]></surname>
<given-names><![CDATA[Corinne Michelle]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad La Salle Facultad Mexicana de Medicina ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Español de México Departamento de Pediatría y Neonatología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Unidad de Investigación en Análisis y Síntesis de la Evidencia ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Secretaría de Salud Hospital Infantil de México Federico Gómez Departamento de Nefrología]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>86</volume>
<numero>6</numero>
<fpage>223</fpage>
<lpage>228</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-00522019000600223&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-00522019000600223&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-00522019000600223&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  El biomarcador lipocalina asociada a gelatinasa de neutrófilo (NGAL) en orina presenta alta excreción en caso de isquemia de células renales del asa de Henle y túbulo colector; hasta ahora los valores normales en neonatos son controversiales.  Objetivos:  Presentar los valores de NGAL urinarios en neonatos sanos a las 24 y 72 horas de vida, según grupos de semanas de edad gestacional (SEG).  Material y métodos:  70 neonatos (25-32 SEG, n = 25; 33-35 SEG, n = 25; 36-38 SEG, n = 10; 39-41 SEG, n=10). Los niveles de NGAL (ng/mL) urinarios se determinaron por quimioluminiscencia. Los valores se muestran como mediana y valores mínimo y máximo (mediana [min - max]).  Resultados:  Los niveles de NGAL fueron diferentes según grupos de edad gestacional, tanto a las 24 horas como a las 72 horas. A las 24 horas = 25-32 SEG = 18.2 [0.5-543.1], 33-35 SEG = 22.3 [0.9-84.4], 36-38 SEG = 10.1 [2.5-181.9], 39-41 SEG = 20.4 [0-577]; a las 72 horas = 25-32 SEG = 47.2 [7.5-441.2], 33-35 SEG = 33.0 [4.7-235.5], 36-38 SEG = 27.7 [4.09-173.1] 39-41 SEG = 17.8 [2.0-113.5].  Conclusión:  Los valores de NGAL urinarios normales en neonatos parece aumentar conforme la edad gestacional y las horas de vida; sin embargo, se requieren más estudios para determinar los valores normales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  The biomarker urinary neutrophil gelatinase-associated lipocalin (u-NGAL) has high excretion in case of ischemia the renal cell loop of Henle and collecting tubule; so far the normal values in neonates are controversial.  Objectives:  To determine u-NGAL values in healthy newborns at 24 and 72 hours of life, according to weeks of gestation (WG).  Material and methods:  Seventy neonates (25-32 WG n = 25, 33-35 WG n = 25 y 36-38 WG n = 10; 39-41 WG, n =10). The u-NGAL (ng/mL) levels were determined by chemiluminescence. Values are shown as median as well as minimum and maximum (median [min - max]).  Results:  u-NGAL levels were different in gestational age group at 24 and 72 hours. 24 hours = 25-32 WG = 18.2 [0.5-543.1], 33-35 WG = 22.3 [0.9-84.4], 36-38 WG = 10.1 [2.5-181.9], 39-41 WG = 20.4 [0-577] ; 72 hours = 25-32 WG = 47.2 [7.5-441.2], 33-35 WG = 33.0 [4.7-235.5], 36-38 WG = 27.7 [4.09-173.1], 39-41 WG = 17.8 [2.0-113.5].  Conclusion:  u-NGAL values in neonates seem to increase with gestational age and postnatal life hours; however, more studies are required to determine normal values.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lipocalina asociada a gelatinasa de neutrófilo]]></kwd>
<kwd lng="es"><![CDATA[niveles urinarios]]></kwd>
<kwd lng="es"><![CDATA[neonatos]]></kwd>
<kwd lng="es"><![CDATA[pretérmino]]></kwd>
<kwd lng="es"><![CDATA[de término]]></kwd>
<kwd lng="es"><![CDATA[biomarcador]]></kwd>
<kwd lng="en"><![CDATA[Urinary neutrophil gelatinase-associated lipocalin]]></kwd>
<kwd lng="en"><![CDATA[urinary levels]]></kwd>
<kwd lng="en"><![CDATA[neonates]]></kwd>
<kwd lng="en"><![CDATA[pre-term]]></kwd>
<kwd lng="en"><![CDATA[term]]></kwd>
<kwd lng="en"><![CDATA[biomarker]]></kwd>
</kwd-group>
</article-meta>
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