Vitamin D and Calcium Supplementation in CKD Stage 3

Recommended Supplementation Regimen

The American College of Rheumatology recommends administering 800 IU of vitamin D3 (cholecalciferol) daily, which has demonstrated a 30% reduction in hip fracture risk and 14% reduction in non-vertebral fracture risk in adults aged 65 and older 1
Target a serum 25-hydroxyvitamin D level of at least 30 ng/mL (75 nmol/L) for optimal fracture prevention in high-risk patients with established osteoporosis and recent fracture 1
Provide 1000-1200 mg of elemental calcium daily from combined dietary and supplemental sources, with a preference for calcium citrate over calcium carbonate 2, 1
Divide calcium doses into no more than 500-600 mg per dose for optimal absorption 1

Check serum calcium and phosphorus levels at least every 3 months during supplementation, and measure 25-hydroxyvitamin D levels after 3 months of starting supplementation to confirm adequاجر 1
Assess for hypercalcemia risk, and monitor for kidney stone risk, which increases modestly with calcium supplementation 3, 1

Combined calcium and vitamin D supplementation reduces hip fracture risk by 16% (RR 0.84) and overall fracture risk by 5% (RR 0.95) in postmenopausal women 1
Vitamin D alone (without calcium) is ineffective for fracture prevention and should not be used as monotherapy 3

Prioritize dietary calcium sources when possible, and use supplements only to reach the total daily target of 1000-1200 mg 1
Ensure adequate vitamin D repletion before initiating potent antiresorptive therapy if bone-specific medications are being considered 1
Continue supplementation for at least 5 years with periodic bone density reassessment every 1-2 years 1