LOINC Code 56938-4: Hydrogen/Expired gas 30 Min post dose lactulose (Exhl gas) [Volume fraction]

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 Hydrogen/Expired gas^30M post dose lactulose. 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: Observation

What it does not mean

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

Key facts

• Hydrogen/Expired gas [Volume Fraction] in Exhaled gas --30 minutes post dose lactulose
• Hydrogen/Expired gas^30M post dose lactulose
• 30M p Lac; After; Breath; CHEMISTRY.CHALLENGE TESTING; ExG; Exhaled gas; Exhaled gas (=breath); Gases; H2; Hyd; p dose; Percent; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; Volfr; Volume fraction

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

Frequently asked questions