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 74788-1: Lactulose challenge (hydrogen breath test) panel (Exhl gas)

Name: LOINC Code 74788-1: Lactulose challenge (hydrogen breath test) panel (Exhl gas)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:55.155Z

74788-1 is a LOINC code used to identify Lactulose 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 Lactulose 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 Lactulose 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

Lactulose challenge (hydrogen breath test) panel - Exhaled gas
Lactulose challenge panel
Breath; CHEMISTRY.CHALLENGE TESTING; ExG; Exhaled gas; Exhaled gas (=breath); Gases; Lactulose HBT; Lactulose HBT Pnl; 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

Lactulose challenge (hydrogen breath test) panel (Exhl gas)Lactulose challenge (hydrogen breath test) panel - Exhaled gasLactulose HBT Pnl ExGLactulose challenge panelPANEL.CHALLactulose challenge (hydrogen breath test) panel, Exhaled gas-

Frequently asked questions

Code details

Code74788-1

SystemLOINC

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

DescriptionLactulose challenge panel

Short nameLactulose HBT Pnl ExG

ComponentLactulose 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 released2.48

Last changed2.48

Consumer names

Lactulose challenge (hydrogen breath test) panel, Exhaled gas

Part names

Lactulose challenge panel-PtExhl gasQnLactulose challenge (hydrogen breath test) panelPoint 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.