serum immunoreactive parathyroid hormone ( pth ) levels were increased in a 50-yr-old man with a unique variant of adult-onset vitamin d-resistant osteomalacia , presenting with high phosphate clearance , mild hypocalcemia , and blunted hypercalcemic and phosphaturic responses to exogenous parathyroid extract .
C0020598
hypocalcemia
C0030520
parathyroid