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Guman.  Yes, you are correct.  Failing kidneys can cause secondary hyperparathyroidism for two reasons: 1) not filtering out enough phosphorus,  and 2) not converting enough calcifediol to calcitriol (Vitamin D3).  Either way, the result is low blood calcium and hence, secondary hyperparathyroidism.


Mader points out that nutritional secondary hyperparathyroidism, which is caused by inadequate calcium phosphorus ratio in the diet, can be a cause of kidney disease, by some mechanism I'm not sure about.  It might be that if the NSHPT causes hypercalcemia then calcium might be deposited into kidney tissue, but I'm not sure about that.  I've read about what is called tertiary hyperparathyroidism which is when the parathyroid gland autonomously releases PTH as a result of longstanding NSHPT.  This uncontrolled release of PTH could cause excess blood calcium, which might then be deposited in the kidney.


So a low calcium condition can cause kidney failure that can cause a low calcium condition... a bad cycle.


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