A patient presents with low serum calcium, high phosphorus and etevated PTH. Which of the following investigations is least contributory to establish a diagnosis -
Ans is option 1.. Vit D levels Vit d deficiency is associated with hypophosphatemia and not hyperphosphatemia Renal failure, pseudohypoparathyroidism and increased urinary myoglobin may all be associated with combination of hypocalcemia, hyperphosphatemia and elevated PTH levels Ref Harrison 19/e p2482
Vitamin D levels
Serum creatinine levels
Cyclic AMP response to PTH
Urine myoglobin
Endocrinology