Skip to content

Lung Disease & Respiratory Health Center

Font Size

Nasal Potential Difference Test for Cystic Fibrosis - Topic Overview

The nasal potential difference test (nasal PD test) measures how well salts (sodium and chloride) flow across the mucous membranes in the nose. This type of test can be helpful when the results of a sweat test or a genetic test are not clear.

In this test, electrodes are placed inside the nose and liquids are run through the nose. There is also a needle placed in the forearm that connects to a machine. Because this test can be uncomfortable, your child may need medicine to help him or her relax before having the test.

Recommended Related to Lung Disease/Respiratory Problems

Risks of Neuroblastoma Screening

Screening tests have risks. Decisions about screening tests can be difficult. Not all screening tests are helpful and most have risks. Before having any screening test, you may want to discuss the test with your doctor. It is important to know the risks of the test and whether it has been proven to reduce the risk of dying from cancer. The risks of neuroblastoma screening include the following: Neuroblastoma may be overdiagnosed. When a screening test result leads to the diagnosis and treatment...

Read the Risks of Neuroblastoma Screening article > >

This test is not used very often because it can be difficult to do and because it is not available in many places.

    WebMD Medical Reference from Healthwise

    Last Updated: July 18, 2013
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
    1
    Next Article:

    Nasal Potential Difference Test for Cystic Fibrosis Topics

    Today on WebMD

    man coughing
    You may not even know you have it.
    blood clot
    Signs of this potentially fatal complication.
     
    man coughing
    When a cold becomes bronchitis.
    human lungs
    Causes behind painful breathing, fluid buildup.
     

    Bronchitis Overview
    SLIDESHOW
    Copd Myth Fact Quiz
    QUIZ
     
    Living With Copd
    VIDEO
    Energy Boosting Foods
    SLIDESHOW
     

    Pollen counts, treatment tips, and more.

    It's nothing to sneeze at.

    Loading ...

    Sending your email...

    This feature is temporarily unavailable. Please try again later.

    Thanks!

    Now check your email account on your mobile phone to download your new app.

    cigarette butts snuffed out in ashtray
    SLIDESHOW
    Healthy Home Health Check
    TOOL
     
    Senior woman stretching
    Article
    Diagnosing Copd
    VIDEO
     

    WebMD Special Sections