The present study was carried out with the objective of determining the effect of parasitosis on hemoglobin levels in children from 3 to 13 years of age at the Hospital de Especialidades Basicas La Noria. Trujillo. June 2017 to June 2018. The methodology is quantitative relationship. The total sample consisted of 155 children who come to H.E.B. LA NORIA 1, those who were randomly selected because of their age and whose participation was voluntary. The data collection instruments were applied to determine the incidence of parasitosis with respect to the effect on hemoglobin by means of the faust technique and grahams test. The incidence of anemia was 4.3%.