 ii Vitamin D deficiency in the general population and in CKD Hypovitaminosis D is common in general population. A study by Thadhanis group of 15,088 adults has shown the prevalence of Vitamin D insufficiency to be between 40-80 in the US general population3. CKD patients are at an increased risk of hypovitaminosis D. In a group of 145 non-dialysis CKD patients from south London, have seen a 85 prevalence of Vitamin D insufficiency 25 hydroxy vitamin D 25OHD 75 nmolL, including 32 deficiency25OHD 37.5nmolL, with a significantly higher risk among Afro-Caribbeans and south-Asians4. 