label: Secondary Parathyroid Hormone Resistance
label_lc: secondary parathyroid hormone resistance
description: "Parathyroid hormone (PTH) resistance caused by vitamin D deficiency and characterized by clinically increased PTH concentrations with relative hyperphosphatemia. The diagnosis can be confirmed by finding of a normal cyclic adenosine monophosphate (cAMP) response to PTH infusion, but deficient phosphaturic response, indicating a defect distal to cAMP generation in renal cells."