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 81457-4: Functional residual capacity --post bronchodilation

Name: LOINC Code 81457-4: Functional residual capacity --post bronchodilation
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:05.775Z

81457-4 is a LOINC code used to identify Functional residual capacity --post bronchodilation 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 Capacity.functional residual^post bronchodilation. It is commonly used with the system or sample type Respiratory system.

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 Capacity.functional residual^post bronchodilation. It is commonly used with the system or sample type Respiratory system.

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

Functional residual capacity --post bronchodilation
Capacity.functional residual^post bronchodilation
After; Breathing; FRC; Lung; Lungs; p BD; Point in time; PST; Pulmonary; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Respiratory; RS; Volume

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

Functional residual capacity --post bronchodilationFRC p BDCapacity.functional residual^post bronchodilationPULMVolPtRespiratory system

Frequently asked questions

Code details

Code81457-4

SystemLOINC

Display nameFunctional residual capacity --post bronchodilation

DescriptionCapacity.functional residual^post bronchodilation

Short nameFRC p BD

ComponentCapacity.functional residual^post bronchodilation

PropertyVol

TimingPt

System (specimen)Respiratory system

ScaleQn

ClassPULM

Example unitsL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.56

Last changed2.56

Part names

Capacity.functional residual^post bronchodilationVolPtRespiratory systemQnVolumePoint in time (spot)

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.