Ask the Doctor
Questions about kidney disease? Risk factors? Signs and symptoms? Are you concerned about yourself, a friend or family member? Ask Dr. Spry.
Most people live normal, healthy lives with one kidney. However, it's important to stay as healthy as possible, and protect the only kidney you have.
There are three main reasons why a person may have only one kidney:
If you were born with only one normal kidney - or if one kidney was damaged or removed during childhood - the remaining kidney will grow faster and become larger than normal. In fact, the remaining kidney can grow to become almost the same size as two combined kidneys. This helps it do all the work that two kidneys would normally do.
This growth is called "compensatory growth" or "regenerative growth." It happens for many reasons. It can result from an increase in cell division or an increase in cell size. For instance, if one kidney is removed, the cells of other kidney divide at an increased rate. Eventually, the remaining kidney can grow until its size approaches the combined size of two kidneys.
In other words, one healthy kidney can work as well as two.
Yes. Careful testing has shown that a transplanted kidney can also increase in size and function. It can reach a level of function that is about 40 percent greater than a normal level for a single kidney.
In general, most people with a single, healthy kidney have few problems. However, some long term problems have been seen in some people.
In some people who were born with a single kidney, or had a kidney removed during childhood, there is a chance of some slight loss in kidney function later in life. This usually takes 25 years or more to happen. There may also be a chance of having high blood pressure later in life. However, the loss in kidney function is usually very mild, and life span is normal. Most people with one kidney live healthy, normal lives with few problems.
You should have your kidney function checked at least once a year. Your healthcare provider will check your kidney function by giving you a simple urine test and a simple blood test. You should also have your blood pressure checked every year.
Physical exercise is healthy and good for you. However, it's important for someone with only one kidney to be careful and protect it from injury. This recommendation applies to anyone with a single kidney, including people who were born with one kidney and people with a kidney transplant. Some doctors think it is best to avoid contact sports like football, boxing, hockey, soccer, martial arts, or wrestling.
Wearing protective gear such as padded vests under clothing can help protect the kidney from injury during sports. This can help lessen the risk, but it won't take away the risk. Talk to your healthcare provider if you (or your child) want to join in contact sports. You should always think about the risks involved in any activity, and carefully consider whether the risks outweigh the benefits.
Most people with one healthy kidney do not need to follow a special diet. If you have a kidney transplant due to kidney disease or kidney failure, you may have some restrictions. If you have questions about your diet, talk to your healthcare provider or a registered dietitian.
If you have more questions, you should speak to your healthcare provider.
If you would like more information, please contact us.
©2014 National Kidney Foundation. All rights reserved. This material does not constitute medical advice. It is intended for informational purposes only. Please consult a physician for specific treatment recommendations.