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This information is provided by
Provet for educational purposes only.
You should seek the advice of your
veterinarian if your pet is ill as only he or she can correctly advise on the
diagnosis and recommend the treatment that is most appropriate for your pet.
There are several
possible causes of hyperphosphataemia Normal plasma inorganic
phosphate concentrations are :
- Dog - 0.8-1.6 mmol/l (OR 1.4-2.9mEq/l OR 2.5-5 mg/dl)
- Cat - 1.3-2.6 mmol/l (OR 2.3-4.7 mEq/l OR 4-8 mg/dl)
Causes of hyperphosphataemia include :
- Growing animals may have high blood phosphate concentrations - up to
twice the normal maximum
- Imbalanced diet - inadequate calcium/excessive phosphorus ; excess
vitamin D intake
- Renal failure - inability to excrete phosphate - chronic, acute,
Fanconi syndrome
- Ruptured bladder
- Hypoadrenocorticism in cats - most have hyperphosphataemia
- Feline hyperthyroidism - c50% have high phosphate
- Hypoparathyroidism - deficiency of PTH leads to retention of
phosphate in the kidney
- Bone tumours - mainly secondary metastatic spread rather than
primary neoplasia
- Acromegaly in female dogs - due to excess growth hormone
NB Blood estimations are unreliable if the blood sample has undergone
haemolysis as this can lead to false high phospahte readings.
Last updated : January 2016
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