Nephrology is the science of how the kidneys work and what functions they perform. The kidneys manage the balance of electrolytes in your body, such as calcium, phosphorus and potassium. Kidneys also filter out waste products and extra water, which then is excreted in urine. If you have kidney failure, you will most likely need dialysis, which is the treatment used to replace the important functions of the kidneys. There are two types of dialysis, hemodialysis and peritoneal dialysis. Both types may affect the calcium levels in your blood. Most dialysis patients have their calcium level checked at least monthly.
Calcium Basics
Calcium is an essential mineral. This means that you must get it through your diet. Calcium helps build your bones, is involved in muscle movement, and works in the nervous system as an electrolyte. Most people get enough calcium through foods such as dairy products, green leafy vegetables and small fish, like sardines. You may also need to take calcium as a supplement if you do not eat enough calcium-rich foods.
Dialysis and Calcium
The solution used during dialysis that allows for the exchange of electrolytes is called dialysate. Dialysate contains calcium so that you can maintain the correct level of this important mineral. If you have either too little or too much calcium, this can affect the delicate balance needed to keep your bones strong and your heart healthy. You may need to take additional calcium if your calcium level is low.
Calcium Sources
Dialysis patients are counseled to limit the amount of dairy in their diet. You will need to get calcium in other ways. Your physician may change the amount of calcium in the dialysate during your dialysis treatment. You may also be given calcium through a supplement. Most patients on dialysis take a phosphate binder when they eat to lower their blood phosphorus levels. Some of these binders contain calcium, thus providing a dual service. These binders include calcium carbonate and calcium acetate. A calcium supplement, with or without vitamin D, may also be recommended.
Considerations
If you are on dialysis, you should only take additional calcium if instructed by your nephrologist or your renal dietitian. Phosphate binders should be prescribed by your doctor. Your dietitian will help you plan your diet and give you pointers on keeping your calcium level optimal. Ask your doctor if you have any questions.
Member Comments