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Laryngopharyngeal Reflux Test

Laryngopharyngeal Reflux Test

The test is used to check whether one suffers from laryngopharyngeal reflux or to evaluate the drug effectiveness against laryngopharyngeal reflux.

Test Procedure

  • Restech is the first and only medical sensor able to measure and chart real-time, continuous pH in both liquid and aerosolized states, revealing reflux-related etiology of presenting symptoms.
  • By using the advanced Restech pH sensor probe, no anesthesia is needed. Eating, drinking and routine activities can be done as usual during the test.
  • The pH sensor probe will be put into the throat through the nose by doctor.
  • The sensor monitors pH value of any liquid or vapor at the throat and the frequency, severity and duration of gastric reflux at the throat for 24 hours.
  • For further enquiries about this test or test booking, please call (852) 2402-2188

Clinical Studies

  • Validation study – Oroparyngeal pH monitoring device  downloading-updates-xxl
  • Users Reference  downloading-updates-xxl
  • A new technique for measurement of pharyngeal pH normal values and discriminating pH threshold  downloading-updates-xxl
  • Clinical studies using Restech  downloading-updates-xxl
  • Effects of PPI therapy for laryngopharyngeal reflux on post treatment symptoms  downloading-updates-xxl
  • High Economic burden of caring for patients with suspecte EER – The American Journal of Gastroenterology  downloading-updates-xxl
  • Pharyngeal pH monitoring better predicts a successful outcome for EER symptoms after antireflux surgery  downloading-updates-xxl
  • Other related publications  downloading-updates-xxl


More Information about Laryngopharyngeal Reflux

What is laryngopharyngeal reflux (LPR)?

Laryngopharyngeal reflux refers to the flow of stomach contents (gastric contents) beyond the muscle ring of the top of the digestive tract (upper oesophageal sphincter) and to the back of the throat and the nasal airway (larynopharynx), causing mucosa inflammation and thus various types of respiratory symptoms. Some people may have sound hoarseness, chronic cough and throat clearing etc. The reflux occurs more often when awake than sleeping.


  • Cough
  • Throat clearing
  • Bitterness after coughing
  • Asthma
  • Heartburn

As for infant and children, the symptoms include:

  • Cough
  • Hoarseness
  • Asthma
  • Sleep-disordered breathing
  • Feeding difficulty
  • Pauses in breathing (apnea)


  1. Drug therapy – Acid suppression with proton pump inhibitors
  2. Changing of lifestyle
    • Avoid eating too rapidly
    • Avoid heavy meals
    • Avoid having meals at night lately
  3. Anti-reflux Surgery

What if LPR is ignored?

  • Oesophagitis
  • Narrow oesophagus – narrowing or tightening of the oesophagus
  • Throat and voice hoarseness
  • Asthma or pneumonia
  • Oesophageal cancer

For further information or test booking, please call (852) 2402-2188 or visit our shops.

Hospitals and clinics who are interested in getting more information on the above device, please call to make an appointment with our product specialist.

Certificates and Awards

 Certificate of Listing-Restech Dx-pH Laryngopharyngeal Reflux measurement system

*Medical Devices Listing HKMD No.170284

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