Skip to content

Esophageal pH Monitoring Report

Published: August 9, 2026Updated: August 16, 2026

A report from an esophageal pH monitoring study, which measures stomach acid reaching the esophagus and may track related symptoms.

Quick summary

["This test helps determine whether frequent reflux symptoms are related to stomach acid entering the esophagus."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
53576-5
Short code
Ph Monitoring Report
Synonyms
Ph Monitoring Report
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
role
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

Esophageal pH monitoring measures how often and for how long stomach acid enters the esophagus. It may also show whether reported symptoms such as heartburn, regurgitation, chest discomfort, or cough occur along with periods of increased acidity.

Why might I need this test?

This test may be used to evaluate persistent reflux symptoms, especially when symptoms do not respond to usual treatment or when the cause of symptoms is unclear. It can also help assess the relationship between acid exposure and symptoms before treatment decisions are made.

How is the test performed?

A small, flexible sensor is placed through the nose and positioned near the lower esophagus. The monitoring device records pH changes while you go about your normal activities and may ask you to note when symptoms occur.

How do I prepare for the test?

Follow the specific instructions provided by the testing facility. Tell the clinician about medicines, recent procedures, and dietary restrictions, because acid-reducing medicines, eating, and drinking can affect the study. Do not stop prescribed medicines unless your clinician instructs you to do so.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Esophageal pH test

Frequently asked questions

Is esophageal pH monitoring the same as an upper endoscopy?
No. pH monitoring records acidity over time without using an endoscope. An upper endoscopy uses a viewing tube to examine the esophagus and stomach.
Will I need to change my daily routine during the test?
You may continue most normal activities, but you should follow the facility's instructions about meals, drinks, activity, and symptom recording. Keep a symptom diary as requested.
Can this test explain symptoms that are not caused by reflux?
It can help show whether symptoms are associated with acid exposure, but a normal result does not rule out every form of reflux or identify another condition. Your clinician will interpret the report in the context of your symptoms and history.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy