Question 303 · LEK · Chronic kidney disease

Which of the following disturbances of calcium and phosphate homeostasis occur in chronic kidney disease?

1) elevated serum PTH concentration;
2) decreased serum FGF-23 (phosphatonin) concentration;
3) decreased calcium concentration;
4) increased phosphate concentration;
5) increased concentration of 1,25(OH)₂D₃.
The correct answer is:
  1. A. 1,3,4.
  2. B. 2,3,4.
  3. C. 2,3,5.
  4. D. 1,3,5.
  5. E. 3,4,5.
Hint

Start from the failing kidney, which cannot excrete phosphate or activate vitamin D, and follow the hormonal responses.

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