Feline Calcium Phosphate

The contour of these small to medium sized (usually 1 to 4 mm), radiodense stones can be smooth, irregular, spiked, or combinations. Even when small they are very radiodense.

Calcium phosphate uroliths (hydroxyapatite, brushite, whitlockite, and octacalcium phosphate) are uncommon in cats. Common conditions associated with these minerals include hypercalcemia, hyperparathyroidism, and dystrophic and ectopic mineralization of vital tissues (i.e. blood clots, urothelium, etc.). Calcium phosphate uroliths (hydroxyapatite, brushite, whitlockite, and octacalcium phosphate) are uncommon in cats. Common conditions associated with these minerals include hypercalcemia, hyperparathyroidism, and dystrophic and ectopic mineralization of vital tissues (i.e. blood clots, urothelium, etc.).

Calcium phosphate uroliths include apatite, brushite, and octacalcium phosphate. • Serum calcium. Investigate causes for hypercalcemia, when present.

• Correct hypercalcemia based on cause (e.g. food change, prednisone, parathyroid removal, etc.). • Hydrochlorothiazide with highly recurrent stones (1mg/kg q12-24 hr).

• Mildly reduced protein/sodium foods that do not overly acidify urine (e.g. c/d multicare diets, others). If needed, Feed canned therapeutic foods or add water to achieve a urine specific gravity <1.030.

Urinalysis every 3 to 6 months to adjust pH to 6.5 to 7.5, and urine specific gravity to 1.030 or lower. Medical imaging every 6 to 12 months to detect recurrent stones when small to permit their easy removal without surgery.

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Feline Calcium Phosphate