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LOINC Code 74789-9: Fructose challenge (hydrogen breath test) panel (Exhl gas)

74789-9 is a LOINC code used to identify Fructose 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 Fructose 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 Fructose 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

Fructose challenge (hydrogen breath test) panel - Exhaled gas
Fructose challenge panel
The hydrogen breath test is based on the fact that the only hydrogen gas source in humans is intestinal bacteria, which produces hydrogen gas during carbohydrate metabolism. After the patient ingests a dose of fructose, any carbohydrate that is not absorbed is metabolized by intestinal bacteria During this process, hydrogen gas is produced, which is absorbed and eventually exhaled through the lungs; the amount of hydrogen in the expired gas is measured at various intervals depending on the protocol being used. The test is used to detect fructose malabsorption, irritable bowel syndrome and small intestine bacterial overgrowth.[PMID16474100]
Breath; CHEMISTRY.CHALLENGE TESTING; ExG; Exhaled gas; Exhaled gas (=breath); Fructose HBT; Fructose HBT Pnl; Gases; Levulose; Pan; PANEL.CHALLENGE; Panl; Pnl; Point in time; QNT; Quan; Quant; Quantitative; Random; Revulose

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

Fructose challenge (hydrogen breath test) panel (Exhl gas)Fructose challenge (hydrogen breath test) panel - Exhaled gasFructose HBT Pnl ExGFructose challenge panelPANEL.CHALFructose challenge (hydrogen breath test) panel, Exhaled gas-

Frequently asked questions

Code details

Code74789-9
SystemLOINC
Display nameFructose challenge (hydrogen breath test) panel (Exhl gas)
DescriptionFructose challenge panel
Short nameFructose HBT Pnl ExG
ComponentFructose 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 changed2.64

Consumer names

Fructose challenge (hydrogen breath test) panel, Exhaled gas

Part names

Fructose challenge panel-PtExhl gasQnFructose 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.

LOINC Code 74789-9 | HealthAssure