Abstract

Background and aim : Congenital adrenal hyperplasia is caused by enzymatic abnormalities in the synthesis of adrenal steroids. A pilot study was carried out to measure the values of 17- hydroxyprogesterone (17-OHP) in a sample of healthy full-term newborns; the present study aims to determine if birth weight or gender have differences on 17-OHP. Design : Transversal, descriptive, and prolective study. Methods : We included 81 healthy full-term newborns with normal prenatal controls born between July 18th, 2014, and August 1st, 2015. We took whole blood using the heel prick test when the babies were three to five days old. Socioeconomic and clinical data were collected. Non-extracted 17-OHP ELISA was used. Its cut-off point was 20 ng/mL. If results were above cut-off point, babies were recalled for a new measure since transient high 17-hydroxyprogesterone levels are possible until babies are three months of age. Results : Gestational age varied between 37.0 to 41.5 weeks. Non-extracted 17-OHP levels ranged between 2.6 to 29.5 ng/mL (median: 11.5, IQR 7.2 to 15.1). 17-OHP levels variation per birth weight or gender were not found. Conclusions : In full therm newborns is expected a lesser variation that may explain these results. Quality issues should be solved before starting a screening program in our population because socioeconomic issues cause most problems in recalling positive screening babies. Resumen Justificacion : la hiperplasia adrenal congenita es una enfermedad autosomica recesiva ocasionada por anormalidades enzimaticas en la sintesis de los esteroides adrenales. Se realizo un estudio para medir los valores de 17- hidroxiprogesterona en una muestra de neonatos a termino sanos. El objetivo fue conocer si existian diferencias en el valor de 17-OHP segun edad gestacional y sexo. Diseno : estudio transversal, descriptivo y prolectivo. Metodos : se incluyeron 81 neonatos con controles prenatales normales y nacidos entre julio 18 de 2014 y agosto 1 de 2015. Se obtuvieron muestras de sangre del talon cuando los bebes tenian entre tres a cinco dias de vida. Se recolectaron datos socioeconomicos y clinicos. Se utilizo un ELISA de 17-OHP no extraida. El punto de corte de la prueba de ELISA de 17-OHP fue 20 ng/mL. Si los resultados estaban por encima del valor de corte, se citaron los bebes para una nueva medicion, dado que es posible hallar una hiper 17-hidroxiprogesteronemiahasta los tres meses de edad. Resultados : la edad gestacional vario entre 37 a 41,2 semanas. Los valores de 17-OHP no extraida variaron entre2,6 a 29,5 ng/mL (mediana 11,5 y RIQ 7,2 – 15,1). Los niveles de 17-OHP no variaron segun peso al nacer o sexo. Conclusion : estos resultados se podrian explicar por una menor variacion esperada en neonatos a termino. Se deben resolver algunos problemas de calidad antes de poder empezar un programa de tamizaje en nuestra poblacion, debido a que causas socioe conomicas generaron dificultad al reevaluarlos ninos con resultados positivos de tamizaje. DOI: http://dx.doi.org/10.21615/cesmedicina.31.2.1

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