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.

LOINCActiveOrder

LOINC Code 50584-2: Lactose challenge (hydrogen breath test) panel (Exhl gas)

Name: LOINC Code 50584-2: Lactose challenge (hydrogen breath test) panel (Exhl gas)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:34.496Z

50584-2 is a LOINC code used to identify Lactose challenge (hydrogen breath test) panel (Exhl gas) 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 Lactose challenge panel. It is commonly used with the system or sample type Exhl gas.

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 Lactose challenge panel. It is commonly used with the system or sample type Exhl gas.

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: Order
Panel type: Panel

What it does not mean

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

Key facts

Lactose challenge (hydrogen breath test) panel - Exhaled gas
Lactose challenge panel
Used to order Hydrogen and/or methane breath test
Breath; CHEMISTRY.CHALLENGE TESTING; ExG; Exhaled gas; Exhaled gas (=breath); Gases; Lactose BT; Lactose challenge Pnl; LTT; Pan; PANEL.CHALLENGE; Panl; Pnl; Point in time; QNT; Quan; Quant; Quantitative; Random

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

Lactose challenge (hydrogen breath test) panel (Exhl gas)Lactose challenge (hydrogen breath test) panel - Exhaled gasLactose challenge Pnl ExGLactose challenge panelPANEL.CHALLactose challenge (hydrogen breath test) panel, Exhaled gas-

Frequently asked questions

Code details

Code50584-2

SystemLOINC

Display nameLactose challenge (hydrogen breath test) panel (Exhl gas)

DescriptionLactose challenge panel

Short nameLactose challenge Pnl ExG

ComponentLactose challenge panel

Property-

TimingPt

System (specimen)Exhl gas

ScaleQn

ClassPANEL.CHAL

StatusACTIVE

Order/ObservationOrder

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.73

Consumer names

Lactose challenge (hydrogen breath test) panel, Exhaled gas

Part names

Lactose challenge panel-PtExhl gasQnPoint in time (spot)Exhaled gas

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.