<?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>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462018000100041</article-id>
<article-id pub-id-type="doi">10.24875/bmhim.m18000006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Índice calcio-creatinina en una muestra matutina de orina para la estimación de hipercalciuria asociada con hematuria no glomerular observada en las edades infanto-juveniles]]></article-title>
<article-title xml:lang="en"><![CDATA[Calcium-creatinine ratio in a morning urine sample for the estimation of hypercalciuria associated with non-glomerular hematuria observed in children and adolescents]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiñones-Vázquez]]></surname>
<given-names><![CDATA[Susana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Liriano-Ricabal]]></surname>
<given-names><![CDATA[María del Rosario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santana-Porbén]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salabarría-González]]></surname>
<given-names><![CDATA[José Reinaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Pediátrico Docente Juan Manuel Márquez Servicio de Laboratorio Clínico Departamento de Estudios de la Función Renal]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2018</year>
</pub-date>
<volume>75</volume>
<numero>1</numero>
<fpage>41</fpage>
<lpage>48</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462018000100041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462018000100041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462018000100041&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  La hipercalciuria suele revelarse durante el diagnóstico diferencial de la hematuria que acompaña a la litiasis renal. La exactitud diagnóstica de la excreción urinaria de calcio puede afectarse por las insuficiencias asociadas con la colección de orina de 24 horas. En este estudio se evaluó la utilidad diagnóstica del índice calcio/creatinina (ICaCre) en la estimación de la hipercalciuria asociada con hematuria y litiasis renal.  Método:  Se calculó el ICaCre de las concentraciones urinarias de calcio (mmol/l) y creatinina (µmol/l) en una alícuota de colección de 24 horas de orina en 169 niños y adolescentes atendidos por hematuria no glomerular (HNG) o litiasis renal (LR). La calciuria de 24 horas &gt; 4.0 mg/kg en 24 horas se distribuyó según la presencia de HNG o LR.  Resultados:  El ICaCre promedio fue de 0.2 ± 0.1 mg/mg. La excreción urinaria de calcio estimada del ICaCre fue significativamente superior a la obtenida en colección de orina de 24 horas (p &lt; 0.05). Los métodos de determinación de la calciuria concordaron en la frecuencia de hipercalciuria (ICaCre 39.5% vs. colección de 24 horas 32.1%; p &gt; 0.05). Según la presencia de HNG o LR, la hipercalciuria se distribuyó de la siguiente manera: no HNG + no LR: 59%; no HNG + LR: 60% (diferencia: +1.0%); HNG + no LR: 68.2% (diferencia: +9.2%); HNG + LR: 73.3% (diferencia: +14.4%).  Conclusiones:  El ICaCre para estimar la excreción urinaria de calcio puede ser efectivo en el estudio de la hipercalciuria asociada con HNG y LR.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  Hypercalciuria might be revealed during the differential diagnosis of hematuria accompanying renal lithiasis (RL). In spite of this, diagnostic accuracy of calcium urinary excretion might be affected by incomplete 24-hour urine collections. In the present study, the diagnostic utility of calcium/creatinine (ICaCre) index for determining hypercalciuria associated with non-glomerular hematuria (NGH) and RL was assessed.  Method:  ICaCre (mg/mg) index was calculated from calcium (mmol/l) and creatinine (µmol/l) concentrations in an aliquot from a 24-hour urine collection in 169 children and adolescents with NGH or RL. Calciuria values &gt; 4.0 mg/kg in 24 hours were distributed according to the presence of NGH or RL.  Results:  Mean ICaCre index was 0.2 ± 0.1 mg/mg. Calciuria values estimated from ICaCre were statistically higher to those from 24-hour urine collection (p &lt; 0.05). The frequency of hypercalciuria was independent from the measurement method (estimated from ICaCre 39.5% vs. 24 h collection 32.1%; p &gt; 0.05). Hypercalciuria distribution was as follows: no NGH + no RL: 59.0%; no NGH + RL: 60.0% (&#8710; = +1.0%); NGH + no RL: 68.2% (&#8710; = +9.2%); NGH + RL: 73.3% (&#8710; = +14.4%).  Conclusions:  The use of ICaCre index for determining calcium urine excretion might be effective in the study of hypercalciuria associated with NGH and RL.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hipercalciuria]]></kwd>
<kwd lng="es"><![CDATA[Orina]]></kwd>
<kwd lng="es"><![CDATA[Hematuria]]></kwd>
<kwd lng="es"><![CDATA[Litiasis renal]]></kwd>
<kwd lng="en"><![CDATA[Hypercalciuria]]></kwd>
<kwd lng="en"><![CDATA[Urine]]></kwd>
<kwd lng="en"><![CDATA[Hematuria]]></kwd>
<kwd lng="en"><![CDATA[Kidney litiasis]]></kwd>
</kwd-group>
</article-meta>
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