The aim of study is to determine the effect of red guava juice on the erythrocyte index profile of adolescent. Method of research is pre experimental with one group pretest postest design. 30 students at AAK 17 August 1945 Semarang were selected by purposive sampling technique. Guava juice are given 3 cc/kg/day for 7 days. Erythrocyte index were measured at before and after treatment. There was a significant differences between pre test and post test. Moreover consumption of red guava juice is more effective in increasing erythrocyte index. Red Guava juice can be a supplementary to prevent occurence of anemia in adolescents.
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