An impedance (im-PEE-dints) probe test helps your health care provider find out if stomach acid is leaving the stomach and moving up toward the throat — a condition called gastroesophageal reflux (GER) or reflux.

The health care provider slid the probe (a thin tube with sensors) through your child's nose and into the esophagus (the passageway that takes food from the throat to the stomach). Some of the sensors track if anything comes back out of the stomach into the esophagus and how often that happens. Other sensors track the acid level (pH) of the stomach liquid. The probe is usually kept in place for 24 hours to take measurements while your child does normal activities like eat, drink, and sleep.

• Sometimes the probe can cause mild throat pain after the test.
  • If your child is over 4 years old, give hard candy or a lozenge. Kids can choke on these, so only give them when they are awake and sitting up.
  • If your child is over 6 years old, have them gargle with a little saltwater 4–6 times a day. To make the saltwater, mix ¼ teaspoon of salt in 8 ounces of warm water.
• If your child takes formula or breast milk, give these as you normally do.
• If your child eats solid food, start by giving cool liquids and soft foods like mashed potatoes. Then offer your child's regular diet when they are ready.
• If your child is uncomfortable, and your health care provider says it's OK, you can give medicine, such as acetaminophen (Tylenol^® or a store brand). Follow the package directions for how much to give and how often.

Your child:

• Has a fever
• Has severe throat, chest, or stomach pain
• Has a nosebleed
• Spits up blood

Your child:

• Has bleeding from the nose or mouth that won't stop
• Is short of breath

When will we get the results of the impedance probe test? The results are usually available in 1–2 weeks. Your health care provider will carefully review the report and discuss the findings with you.