The kidneys help control the amount of phosphate in the blood. Extra phosphate is filtered by the kidneys and passes out of the body in the urine. Mom's phosphorus level is high based on her blood test result last week. Her kidneys do not excrete enough phosphate. High phosphorus in her blood caused by the kidney problem.
The blood test results shows good signs of her electrolytes ( calcium, potassium, sodium) except her phosphate. Getting and preparing food for mom is too delicate, making sure all are balance. All are serve in low and less than what a normal person eat.
Fish are high in phosphate, should kidney patients limit the fish especially salmon and other fish that has no scales. It is very important to give right amount of meal and balance.