Chronic kidney disease

Definition

Chronic kidney disease is the slow loss of kidney function over time. The main job of the kidneys is to remove wastes and excess water from the body.

Alternative Names

Kidney failure - chronic; Renal failure - chronic; Chronic renal insufficiency; Chronic kidney failure; Chronic renal failure

Causes

Chronic kidney disease (CKD) slowly gets worse over months or years. You may not notice any symptoms for some time. The loss of function may be so slow that you do not have symptoms until your kidneys have almost stopped working.

The final stage of CKD is called end-stage renal disease (ESRD). At this stage, the kidneys are no longer able to remove enough wastes and excess fluids from the body. At this point, you would need dialysis or a kidney transplant.

Diabetes and high blood pressure are the 2 most common causes and account for most cases.

Many other diseases and conditions can damage the kidneys, including:

CKD leads to a buildup of fluid and waste products in the body. This condition affects most body systems and functions, including:

  • High blood pressure
  • Low blood cell count
  • Vitamin D and bone health

Symptoms

The early symptoms of CKD are the same as for many other illnesses. These symptoms may be the only sign of a problem in the early stages.

Symptoms may include:

Symptoms that may occur when kidney function has gotten worse include:

Exams and Tests

Most people will have high blood pressure at all stages of CKD. During an exam, your health care provider may also hear abnormal heart or lung sounds in your chest. You may have signs of nerve damage during a nervous system exam.

A urinalysis may show protein or other changes in your urine. These changes may appear months to years before symptoms appear.

Tests that check how well the kidneys are working include:

CKD changes the results of several other tests. You may need to have the following blood tests as often as every 2 to 3 months when kidney disease gets worse:

Other tests that may be done to look for the cause or type of kidney disease include:

This disease may also change the results of the following tests:

Treatment

Blood pressure control will slow further kidney damage.

  • Angiotensin-converting enzyme (ACE) inhibitors or angiotensin receptor blockers (ARBs) are used most often.
  • The goal is to keep blood pressure at or below 130/80 mm Hg.

Making lifestyle changes can help protect the kidneys, and prevent heart disease and stroke, such as:

  • DO NOT smoke.
  • Eat meals that are low in fat and cholesterol.
  • Get regular exercise (talk to your provider or nurse before starting to exercise).
  • Take medicines to lower your cholesterol, if needed.
  • Keep your blood sugar under control.
  • Avoid eating too much salt or potassium.

Always talk to your provider before taking any over-the-counter medicine. This includes vitamins, herbs and supplements. Make sure all of the providers you visit know you have CKD. Other treatments may include:

  • Medicines called phosphate binders, to help prevent high phosphorous levels
  • Extra iron in the diet, iron pills, iron given through a vein (intravenous iron) special shots of a medicine called erythropoietin, and blood transfusions to treat anemia
  • Extra calcium and vitamin D (always talk to your provider before taking)

Your provider may have you follow a special diet for CKD.

  • Limiting fluids
  • Eating less protein
  • Restricting phosphorous and other electrolytes
  • Getting enough calories to prevent weight loss

All people with CKD should be up-to-date on the following vaccinations:

Support Groups

More information and support for people with CKD and their families can be found at a kidney disease support group.

Outlook (Prognosis)

Many people are not diagnosed with CKD until they have lost most of their kidney function.

There is no cure for CKD. Whether it worsens to ESRD, and how quickly, depends on:

  • The cause of kidney damage
  • How well you take care of yourself

Kidney failure is the last stage of CKD. This is when your kidneys can no longer support our body's needs.

Your provider will discuss dialysis with you before you need it. Dialysis removes waste from your blood when your kidneys can no longer do their job.

In most cases, you will go to dialysis when you have only 10 to 15% of your kidney function left.

Even people who are waiting for a kidney transplant may need dialysis while waiting.

Possible Complications

Complications may include:

Prevention

Treating the condition that is causing the problem may help prevent or delay CKD. People who have diabetes should control their blood sugar and blood pressure levels and should not smoke.

References

Christov M, Sprague SM. Chronic kidney disease - mineral bone disorder. In: Yu ASL, Chertow GM, Luyckx VA, Marsden PA, Skorecki K, Taal MW, eds. Brenner and Rector's The Kidney. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 53.

Grams ME, McDonald SP. Epidemiology of chronic kidney disease and dialysis. In: Johnson RJ, Floege J, Tonelli M, eds. Comprehensive Clinical Nephrology. 7th ed. Philadelphia, PA: Elsevier; 2024:chap 80.

Levey AS, Sarnak MJ. Chronic kidney disease. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 116.

Taal MW. Classification and management of chronic kidney disease. In: Yu ASL, Chertow GM, Luyckx VA, Marsden PA, Skorecki K, Taal MW, eds. Brenner and Rector's The Kidney. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 59.

Related Links

Review Date: 8/28/2023
Reviewed By: Walead Latif, MD, Nephrologist and Clinical Associate Professor, Rutgers Medical School, Newark, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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