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.

LOINCActiveObservation

LOINC Code 71794-2: Maximum expiratory gas flow Respiratory system airway --pre therapy

Name: LOINC Code 71794-2: Maximum expiratory gas flow Respiratory system airway --pre therapy
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:50.624Z

71794-2 is a LOINC code used to identify Maximum expiratory gas flow Respiratory system airway --pre therapy 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 Expiratory gas flow.max^pre therapy. It is commonly used with the system or sample type Respiratory system.airway.

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 Expiratory gas flow.max^pre therapy. It is commonly used with the system or sample type Respiratory system.airway.

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

Maximum expiratory gas flow Respiratory system airway --pre therapy
Expiratory gas flow.max^pre therapy
Before; Breathing; Dynamic; Flow; Gases; Largest; Lung; Lungs; Maximal; Maximum; Peak; Peak expiratory flow; PEF; Point in time; Pulmonary; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Respiratory; RS; Volume rate; vRate

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

Maximum expiratory gas flow Respiratory system airway --pre therapyPEF pre therapy AirwayExpiratory gas flow.max^pre therapyPULMVRatPtRespiratory system.airway

Frequently asked questions

Code details

Code71794-2

SystemLOINC

Display nameMaximum expiratory gas flow Respiratory system airway --pre therapy

DescriptionExpiratory gas flow.max^pre therapy

Short namePEF pre therapy Airway

ComponentExpiratory gas flow.max^pre therapy

PropertyVRat

TimingPt

System (specimen)Respiratory system.airway

ScaleQn

ClassPULM

Example unitsL/s

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.40

Last changed2.67

Part names

Expiratory gas flow.max^pre therapyVRatPtRespiratory system.airwayQnVolume RatePoint in time (spot)Respiratory system airway

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.