The present study aimed to detect the percentage of infection with Giardia lamblia in different ages and sexes in Sulaimaniya and Chamchamal, and showing the effects of Giardiasis on some biochemical par0meters and PCV% which related to the public health in society.The prevalence of Giardiasis and its relationship to age, and sex was studied randomly in 1200 out patients in two different areas, Sulaimani city( urban )andChamchamal (semirural) during period from April to June 2007. Stool samples were examined microscopically by direct general stool examination (GSE).40 blood samples were collected from patients whom found infected with G. lambila for estimation of PCV ,TSP, Alb, Glo, A/G, S.Chol. S.TG, and S. Cal. The results showed that the higher rate of infection was recorded in Chamchamal as semirural. Age factor had effect on the prevalence of infection; the rate in children (55%) was higher significantly than in adults(45%).The percentage of infection was higher in females than in males.Infected children suffered from reduction in PCV,S.chol. and S. Cal.and A/G ratio which attributed to elevation of Glob, infected adults suffered from reduction in S.Chol., S. TG., S.Cal., and Glob, which cause the elevation of A/G. It can be concluded from the present study that Giardiasis was higher in semi rural area than urban, children than adults, and in females than males. PCV and serum Calcium were the most affected by the Giardiasis.
