LOINCActive

LOINC Code 19993-5: Oxygen/Gas total Inhaled gas by Gas dilution.rebreath

19993-5 is a LOINC code used to identify Oxygen/Gas total Inhaled gas by Gas dilution.rebreath 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 Oxygen/Gas.total. It is commonly used with the system or sample type Inhl 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 Oxygen/Gas.total. It is commonly used with the system or sample type Inhl 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
  • Method: Gas dilution.rebreathing

What it does not mean

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

Key facts

  • Oxygen/Gas total Inhaled gas by Gas dilution.rebreath
  • Oxygen/Gas.total
  • Dil; Dilut; Gas Dil.rebreath; Gases; IhG; Inhaled Gas; Inspired; Lung; O2; Percent; Point in time; PULMONARY; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Respiratory; tO2; Tot; Totl; 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

Oxygen/Gas total Inhaled gas by Gas dilution.rebreathFIO2 Gas Dil.rebreathOxygen/Gas.totalPULMVFrPtInhl gas

Frequently asked questions

Code details

Code19993-5
SystemLOINC
Display nameOxygen/Gas total Inhaled gas by Gas dilution.rebreath
DescriptionOxygen/Gas.total
Short nameFIO2 Gas Dil.rebreath
ComponentOxygen/Gas.total
PropertyVFr
TimingPt
System (specimen)Inhl gas
ScaleQn
MethodGas dilution.rebreathing
ClassPULM
Example units%
StatusACTIVE

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0l
Last changed2.73

Part names

Oxygen/Gas.totalVFrPtInhl gasQnGas dilution.rebreathingVolume FractionPoint in time (spot)Inhaled gasGas dilution.rebreath

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.