Introduccion: sindrome nefritico subclinico es la presencia de hematuria, hipocomplementemia y/o proteinuria sin presencia de signos y/o sintomas clinicos. Objetivo: determinar la incidencia del sindrome nefritico subclinico en ninos que conviven con pacientes pediatricos con diagnostico de sindrome nefritico agudo (SNA). Metodos: se realizo visita familiar para identificar a ninos convivientes, en los dos meses previos, con pacientes pediatricos hospitalizados con SNA en el Hospital Infantil Napoleon Franco Pareja, en Cartagena, Colombia, entre el 1 de febrero de 2007 y el 31 de enero de 2008. Se realizo historia clinica, uroanalisis y niveles sericos de C3 y C4. Resultados: cincuenta y nueve contactos familiares fueron identificados y estudiados. Ningun caso de sindrome nefritico subclinico fue detectado. Ningun caso de hematuria microscopica. Hipocomplementemia fue observada en el 8.4% de los ninos convivientes. Conclusiones : aunque en la pequena muestra estudiada, no se observaron casos de sindrome nefriticos subclinico, se ha senalado que los contactos familiares tienen mayor riesgo para desarrollarlo que la poblacion general. Deben realizarse estudios con mayor numero de pacientes y convivientes. Rev.cienc.biomed. 2012;3(1):86-89 PALABRAS CLAVES Glomerulonefritis; Hematuria; Hipocomplementemia; Proteinuria; Sindrome nefritico. SUMMARY Introduction: subclinical nephritic syndrome is the presence of hematuria, hypocomplementemia and/or proteinuria without the presence of signs and/or symptoms. Objective: to determine the incidence of subclinical nephritic syndrome in children living with pediatric patients diagnosed with acute nephritic syndrome. Methods: family visit to identify children living together in the two previous months, with pediatric patients hospitalized with acute nephritic syndrome, at Hospital Infantil Napoleon Franco Pareja, in Cartagena, Colombia, from February 1, 2007 to January 31, 2008. A complete medical history, urinalysis and serum levels of C3 and C4 were done. Results: Fifty-nine household contacts were identified and studied. No cases of subclinical nephritic syndrome were detected. No cases of microscopic hematuria. Hypocomplementemia was observed in 8.4% of children living together. Conclusions: Although the small sample, there were no cases of nephritic syndrome subclinical noted that household contacts are at increased risk than the general population. Studies should be conducted with more patients and cohabitants. Rev.cienc.biomed. 2012;3(1):86-89 KEY WORDS Glomerulonephritis; hematuria; hypocomplementemia; proteinuria; Nephritic syndrome.