Excess phosphorus intake can make CRF worse. Phosphorus levels should be monitored on a regular basis. Potassium Potassium levels are critical in CRF cats and should be regularly monitored. Potassium loss can result from frequent vomiting and in urination. Sub-Q therapy may also dilute potassium even further.
Low potassium is called hypokalemia.
Even if your cat's potassium is in the low normal range, it may be necessary to give him a potassium supplement. This is because with CRF, critical stored potassium in the tissues is used, often making the blood analysis appear normal. Sodium Sodium should be monitored closely as the kidneys of CRF cats are unable to excrete sufficient quantities of it. This may result in hypertension. The values in the table are in US units.