As a first step toward diagnosis of kidney disease, your doctor discusses your personal and family history with you. Among other things, your doctor might ask questions about whether you've been diagnosed with high blood pressure, if you've taken a medication that might affect kidney function, if you've noticed changes in your urinary habits, and whether you have any family members who have kidney disease.
Next, your doctor performs a physical exam, also checking for signs of problems with your heart or blood vessels, and conducts a neurological exam.
For kidney disease diagnosis, you may also need certain tests and procedures, such as:
- Blood tests. Kidney function tests look for the level of waste products, such as creatinine and urea, in your blood.
- Urine tests. Analyzing a sample of your urine may reveal abnormalities that point to chronic kidney failure and help identify the cause of chronic kidney disease.
- Imaging tests. Your doctor may use ultrasound to assess your kidneys' structure and size. Other imaging tests may be used in some cases.
- Removing a sample of kidney tissue for testing. Your doctor may recommend a kidney biopsy to remove a sample of kidney tissue. Kidney biopsy is often done with local anesthesia using a long, thin needle that's inserted through your skin and into your kidney. The biopsy sample is sent to a lab for testing to help determine what's causing your kidney problem.
Depending on the underlying cause, some types of kidney disease can be treated. Often, though, chronic kidney disease has no cure.
Treatment usually consists of measures to help control signs and symptoms, reduce complications, and slow progression of the disease. If your kidneys become severely damaged, you may need treatment for end-stage kidney disease.
Treating the cause
Your doctor will work to slow or control the cause of your kidney disease. Treatment options vary, depending on the cause. But kidney damage can continue to worsen even when an underlying condition, such as high blood pressure, has been controlled.
Kidney disease complications can be controlled to make you more comfortable. Treatments may include:
- High blood pressure medications. People with kidney disease may experience worsening high blood pressure. Your doctor may recommend medications to lower your blood pressure — commonly angiotensin-converting enzyme (ACE) inhibitors or angiotensin II receptor blockers — and to preserve kidney function. High blood pressure medications can initially decrease kidney function and change electrolyte levels, so you may need frequent blood tests to monitor your condition. Your doctor will likely also recommend a water pill (diuretic) and a low-salt diet.
- Medications to lower cholesterol levels. Your doctor may recommend medications called statins to lower your cholesterol. People with chronic kidney disease often experience high levels of bad cholesterol, which can increase the risk of heart disease.
- Medications to treat anemia. In certain situations, your doctor may recommend supplements of the hormone erythropoietin (uh-rith-roe-POI-uh-tin), sometimes with added iron. Erythropoietin supplements aid in production of more red blood cells, which may relieve fatigue and weakness associated with anemia.
- Medications to relieve swelling. People with chronic kidney disease may retain fluids. This can lead to swelling in the legs, as well as high blood pressure. Medications called diuretics can help maintain the balance of fluids in your body.
- Medications to protect your bones. Your doctor may prescribe calcium and vitamin D supplements to prevent weak bones and lower your risk of fracture. You may also take medication known as a phosphate binder to lower the amount of phosphate in your blood, and protect your blood vessels from damage by calcium deposits (calcification).
- A lower protein diet to minimize waste products in your blood. As your body processes protein from foods, it creates waste products that your kidneys must filter from your blood. To reduce the amount of work your kidneys must do, your doctor may recommend eating less protein. Your doctor may also ask you to meet with a dietitian who can suggest ways to lower your protein intake while still eating a healthy diet.
Your doctor may recommend follow-up testing at regular intervals to see whether your kidney disease remains stable or progresses.
Treatment for end-stage kidney disease
If your kidneys can't keep up with waste and fluid clearance on their own and you develop complete or near-complete kidney failure, you have end-stage kidney disease. At that point, you need dialysis or a kidney transplant.
- Dialysis. Dialysis artificially removes waste products and extra fluid from your blood when your kidneys can no longer do this. In hemodialysis, a machine filters waste and excess fluids from your blood. In peritoneal dialysis, a thin tube (catheter) inserted into your abdomen fills your abdominal cavity with a dialysis solution that absorbs waste and excess fluids. After a period of time, the dialysis solution drains from your body, carrying the waste with it.
- Kidney transplant. A kidney transplant involves surgically placing a healthy kidney from a donor into your body. Transplanted kidneys can come from deceased or living donors. You'll need to take medications for the rest of your life to keep your body from rejecting the new organ. You don't need to be on dialysis to have a kidney transplant.
For some who choose not to have dialysis or a kidney transplant, a third option is to treat kidney failure with conservative measures. However, once you have complete kidney failure, your life expectancy generally would be only a few months.
Potential future treatments
Regenerative medicine holds the potential to fully heal damaged tissues and organs, offering solutions and hope for people who have conditions that today are beyond repair.
Regenerative medicine approaches include:
- Boosting the body's natural ability to heal itself
- Using healthy cells, tissues or organs from a living or deceased donor to replace damaged ones
- Delivering specific types of cells or cell products to diseased tissues or organs to restore tissue and organ function
For people with chronic kidney disease, regenerative medicine approaches may be developed in the future to help slow progression of the disease.
Lifestyle and home remedies
As part of your treatment for chronic kidney disease, your doctor may recommend a special diet to help support your kidneys and limit the work they must do. Ask your doctor for a referral to a dietitian who can analyze your current diet and suggest ways to make your diet easier on your kidneys.
Depending on your situation, kidney function and overall health, your dietitian may recommend that you:
- Avoid products with added salt. Lower the amount of sodium you eat each day by avoiding products with added salt, including many convenience foods, such as frozen dinners, canned soups and fast foods. Other foods with added salt include salty snack foods, canned vegetables, and processed meats and cheeses.
- Choose lower potassium foods. Your dietitian may recommend that you choose lower potassium foods at each meal. High-potassium foods include bananas, oranges, potatoes, spinach and tomatoes. Examples of low-potassium foods include apples, cabbage, carrots, green beans, grapes and strawberries. Be aware that many salt substitutes contain potassium, so you generally should avoid them if you have kidney failure.
- Limit the amount of protein you eat. Your dietitian will estimate the appropriate number of grams of protein you need each day and make recommendations based on that amount. High-protein foods include lean meats, eggs, milk, cheese and beans. Low-protein foods include vegetables, fruits, breads and cereals.
Coping and support
Receiving a diagnosis of chronic kidney disease can be worrisome. You may be concerned about what your diagnosis means for your future health. To help you cope with your feelings, consider trying to:
- Connect with other people who have kidney disease. Other people with chronic kidney disease understand what you're feeling and can offer unique support. Ask your doctor about support groups in your area. Or contact organizations such as the American Association of Kidney Patients, the National Kidney Foundation or the American Kidney Fund for groups in your area.
- Maintain your normal routine, when possible. Try to maintain a normal routine, doing the activities you enjoy and continuing to work, if your condition allows. This may help you cope with feelings of sadness or loss that you may experience after your diagnosis.
- Be active most days of the week. With your doctor's advice, aim for at least 30 minutes of physical activity most days of the week. This can help you cope with fatigue and stress.
- Talk with a person you trust. Living with chronic kidney disease can be stressful, and it may help to talk about your feelings. You may have a friend or family member who is a good listener. Or you may find it helpful to talk with a faith leader or someone else you trust. Ask your doctor for a referral to a social worker or counselor.
Preparing for your appointment
You'll likely start by seeing your primary care doctor if you have signs or symptoms of kidney disease. If lab tests reveal you have kidney damage, you may be referred to a doctor who specializes in kidney problems (nephrologist).
What you can do
To get ready for your appointment, ask if there's anything you need to do ahead of time, such as limit your diet. Then make a list of:
- Your symptoms, including any that seem unrelated to your kidneys or urinary function
- All your medications and doses, vitamins, or other supplements that you take
- Your key medical history, including any other medical conditions
- Questions to ask your doctor, listing the most important ones first in case time runs short
Take a family member or friend along, if possible. Sometimes it can be hard to remember everything you talked about with your doctor, and a relative or friend may hear something that you missed or forgot.
For chronic kidney disease, some basic questions to ask your doctor include:
- What's the level of damage to my kidneys?
- Is my kidney function worsening?
- Do I need more tests?
- What's causing my condition?
- Can the damage to my kidneys be reversed?
- What are my treatment options?
- What are the potential side effects of each treatment?
- I have these other health conditions. How can I best manage them together?
- Do I need to eat a special diet?
- Can you refer me to a dietitian who can help me plan my meals?
- Should I see a specialist?
- Is there a generic alternative to the medicine you're prescribing?
- Are there any brochures or other printed material that I can have? What websites do you recommend?
- How often do I need to have my kidney function tested?
Don't hesitate to ask any other questions during your appointment as they occur to you.
What to expect from your doctor
Your doctor may ask you questions, such as:
- Are you experiencing any symptoms, such as changes in your urinary habits or unusual fatigue?
- How long have you had symptoms?
- Have you been diagnosed or treated for high blood pressure?
- Have you noticed any changes in your urinary habits?
- Does anyone in your family have kidney disease?
- What medications are you currently taking? What doses?