Overview Oral Alfacalcidol and Coronary Artery Calcification in Predialysis Chronic Kidney Disease Status: Unknown status Trial end date: 2012-12-01 Target enrollment: Participant gender: Summary Active vitamin D at therapeutic dose may prevent vascular calcification but in supraphysiologic dose may precipitate it. Phase: Phase 2 Details Lead Sponsor: Ramathibodi HospitalTreatments: AlfacalcidolHydroxycholecalciferols