Abstract : In the present work; 261 of patients who revised Telkeif governmental healthcarecenter/North Nineveh were chosen to apply the study, in the period between September/2019 andJanuary/2020. Revisers age were ranged 1-40 years. They all diagnosed to have intestinal parasites.Hemoglobin concentration and RBC count were estimated for each patient. The prevalence of intestinalparasite was: 34.2% for Entamoeba histolytica, 28.7% for Giardia lamblia, 13.4% for Ancylostomaduodenale, 10.3% for Trichuris trichura, 7.7% for Ascaris lumbricoides and 5.7% for Hymenolepis nana.Intestinal parasites were most common in 11-20 age group (infection percentage 34.1%), in which parasiticinfections were distributed as: 13.4% for Entamoeba histolytica, 7.3% for Giardia lamblia, 5.4% forAncylostoma dudenale, 3.8% for Trichuris trichura, 2.7% for Ascaris lumbricoides and 1.5% forHymenolepis nana. On the other hands, Intestinal parasites were the less prevalence in 31-40 age group,with infection distribution: 6.5% for E. histolytica, 4.7% for G. lamblia, 0% for A.duodenale, 1.9% for T.trichura, 1.5% for A. lumbricoides and 0% for H. nana. Generally, 36.45% of the parasitized patients (95 of261) were detected to have moderate diminish in hemoglobin concentration (9.6 g/dl) and RBC count (3.44×1012). Hemoglobin concentration and RBC count were varying according to parasite species. The lowesthemoglobin concentration was recorded in patients with E. histolytica (8.4 g/dl), the lowest RBC count wasfound in patients with A. duodenale (2.9×1012). The less diminish in both hemoglobin concentration andRBC count was detected in patients with H. nana (10.9 g/dl and 4×1012 respectively)