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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

Cystic Fibrosis

Important It is possible that the main title of the report Cystic Fibrosis is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.

Read the Cystic Fibrosis 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: June 15, 2011
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.
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