Vitamin D and parathyroid hormone status in community-dwelling elderly patients with mild-to-moderate kidney impairment.

The prevalence of vitamin D deficiency was higher in patients with eGFR 30 - < 60 mL/min/1.73 m2 than those with eGFR ≥ 60 mL/min/1.73 m2. Both decreased serum 25(OH)D levels and decreased eGFR were independently associated with increased serum PTH levels among these patients.