Laboratory findings in secondary hyperparathyroidism - McMaster Textbook of Internal Medicine

Table 6.6-2. Laboratory findings in secondary hyperparathyroidism
Cause	Total Ca/iCa	PO4	25(OH)D	PTH
Chronic Kidney Disease	Low/normal	High/very high	Low/ normal	High/very high
Vitamin D insufficiency	Low/normal	Low/normal	Low	High
Insufficient calcium intake	Low/normal	Normal	Normal	High
Malabsorption	Low/normal	Low	Low	High
Pseudohypoparathyroidism	Low	High	Normal	High
25(OH)D, 25-hydroxyvitamin D; iCa, ionized calcium; PO4, phosphate; PTH, parathyroid hormone.