Cats with overly - high blood phosphorus levels can benefit from a diet low in phosphorus as well as a very high fluid intake. (2ndchance.info)
As your pet's blood phosphorus level increases, its bones loose calcium and weaken. (2ndchance.info)
(ref) It appears that very small increases in blood phosphorus levels — perhaps even levels in the high «normal» range — can be detrimental over time. (2ndchance.info)