What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 98858-4: Esophageal pH monitoring study Document

Name: LOINC Code 98858-4: Esophageal pH monitoring study Document
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:33.063Z

98858-4 is a LOINC code used to identify Esophageal pH monitoring study Document in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Esophageal pH monitoring study. It is commonly used with the system or sample type ^Patient.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Esophageal pH monitoring study. It is commonly used with the system or sample type ^Patient.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Both

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Esophageal pH monitoring study Document

Esophageal pH monitoring study

Esophageal pH monitoring is the gold standard procedure for diagnosing gastroesophageal reflux disease (GERD). The procedure can be done using a wireless pH capsule, a pH probe, or a new method that combines multichannel intraluminal impedance (MII) testing with pH testing. [NCBI BooksNBK553089]

DOC.MISC; Document; Finding; Findings; MISC; Point in time; Random; Study report

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Esophageal pH monitoring study DocumentEsophageal pH monitoring study DocEsophageal pH monitoring studyDOC.MISCFindPt^Patient

Frequently asked questions

Code details

Code98858-4

SystemLOINC

Display nameEsophageal pH monitoring study Document

DescriptionEsophageal pH monitoring study

Short nameEsophageal pH monitoring study Doc

ComponentEsophageal pH monitoring study

PropertyFind

TimingPt

System (specimen)^Patient

ScaleDoc

ClassDOC.MISC

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.72

Last changed2.72

Part names

Esophageal pH monitoring studyFindPt^PatientDocFindingPoint in time (spot)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.