Table 1.

Summary of National Kidney Foundation guidelines on evaluation of calcium and phosphorus metabolism and parathyroid hormone

CKD stage	GFR range (mL/min/1.73 m2)	Measure PTH	Measure calcium and phosphorus	Target PTH (pg/mL)
Progressive stage 3	30–59	Baseline	6–12 months	< the upper limit of normal for assay
Stage 4	15–29	6–12 months	3–6 months	< the upper limit of normal for assay
Stage 5	< 15 or dialysis	3–6 months	1–3 months	2–9 x the normal limit of the assay

CKD = chronic kidney disease; GFR = glomerular filtration rate; PTH = parathyroid hormone.