Effect of Vitamin D Supplementation on Coronary Calcification and Parathyroid Hormone in CKD Patients

We will call for 350 CKD patients (250 CKD3-5stage and 100 CKD5D stage)who suffer from vitamin D deficiency.They will be divided into 2 groups. One group will be given vitamin D and the other will not. They will take coronary artery CT test every year(in 2 years).We will compare the coronary calcification progression between the 2 groups.