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.

LOINCActive

LOINC Code 19938-0: Maximum expiratory gas flow Respiratory system airway --post therapy

Name: LOINC Code 19938-0: Maximum expiratory gas flow Respiratory system airway --post therapy
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:28.843Z

19938-0 is a LOINC code used to identify Maximum expiratory gas flow Respiratory system airway --post 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^post 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^post 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

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 --post therapy
Expiratory gas flow.max^post therapy
After; Breathing; Dynamic; Flow; Gases; Largest; Lung; Lungs; Maximal; Maximum; p therapy; Peak; Peak expiratory flow; PEF; Point in time; PST; 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 --post therapyPEF p therapy AirwayExpiratory gas flow.max^post therapyPULMVRatPtRespiratory system.airway

Frequently asked questions

Code details

Code19938-0

SystemLOINC

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

DescriptionExpiratory gas flow.max^post therapy

Short namePEF p therapy Airway

ComponentExpiratory gas flow.max^post therapy

PropertyVRat

TimingPt

System (specimen)Respiratory system.airway

ScaleQn

ClassPULM

StatusACTIVE

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.44

Part names

Expiratory gas flow.max^post 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.