Figure 20.

Prevalence of deficiency of 1,25(OH)₂D₃, 25(OH)D₃, and secondary hyperparathyroidism by GFR intervals. GFR, glomerular filtration rate; PTH, parathyroid hormone. Adapted by permission from Macmillan Publishers Ltd: Kidney International. Levin A, Bakris GL, Molitch M, et al.³⁶⁷ Prevalence of abnormal serum vitamin D, PTH, calcium, and phosphorus in patients with chronic kidney disease: results of the study to evaluate early kidney disease. Kidney Int 2007; 71: 31-38; accessed http://www.nature.com/ki/journ al/v71/n1/pdf/5002009a.pdf