25 (OH) vitamin D plays an important role in many places through the body. Its deficien- cy can cause rickets or osteomalacia. This is particularly im- portant in hemodialysis (HD) patients who are at icreased risk due to decreased sunlight exposure and deterioration of their mineral homeostasis.To determine the prevalence of 25 (OH) vitamin D deficiency in HD patients at Rafic Hariri University Hospital (RHUH), compared to a sample of the general population matched for gender and age, and to evaluate the effectiveness of 25 (OH) vitamin D supplementation in HD deficient group.This is a cross sectional study conducted since December 2012, comparing the prevalence of 25 (OH) vitamin D deficiency in HD patients in the dialysis center at RHUH, with patients from the general population who sought medical attention at RHUH for purposes other than HD, matched for age and gender. 25 (OH) vitamin D levels were measured with radio- immunoassay method (LOINC) at CIC European Lab, Bar- celona, Spain. A pilot study was conducted with the 34 HD patients who turned out to be deficient or insufficient in 25 (OH) vitamin D. We supplemented them with cholecalciferol over 6 months. We then assessed their vitamin D levels, and biochemistry parameters.The prevalence of 25 (OH) vitamin D deficiency in the sample of HD patients at baseline was 32% while that of insufficiency was 36%. The prevalence of 25 (OH) vitamin D deficiency in the sample of general population was 67%. No correlation was found be- tween 25 (OH) vitamin D levels and the studied parameters. In the pilot study, after six months of cholecalciferol supple- mentation, there was a significant improvement in 25 (OH) vitamin D levels in the deficient and insufficient groups.The sample studied in the general population showed high prevalence of 25 (OH) vitamin D deficiency (67%). The sample studied in HD patients showed a preva- lence of 25 (OH) vitamin D deficiency of 32% and insuffi- ciency of 36%. The pilot study showed that 25 (OH) vitamin D supplementation in the form of cholecalciferol is beneficial in HD patients.
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