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 69979-3: FEF 50%/FIV 50% --pre bronchodilation

Name: LOINC Code 69979-3: FEF 50%/FIV 50% --pre bronchodilation
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:48.867Z

69979-3 is a LOINC code used to identify FEF 50%/FIV 50% --pre 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 Gas flow at 50% of forced expiration/Gas flow at 50% of forced inspiration^pre 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 Gas flow at 50% of forced expiration/Gas flow at 50% of forced inspiration^pre 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

FEF 50%/FIV 50% --pre bronchodilation
Gas flow at 50% of forced expiration/Gas flow at 50% of forced inspiration^pre bronchodilation
Before; Breathing; Dynamic; Exp; FEF 50%; FIV 50%; Gases; In; Insp; Inspiratory; Lung; Lungs; Point in time; pre BD; Pulmonary; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Relative volume rate; Respiratory; RS

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

FEF 50%/FIV 50% --pre bronchodilationFEF 50%/FIV 50% pre BDGas flow at 50% of forced expiration/Gas flow at 50% of forced inspiration^pre bronchodilationPULMRelVRatPtRespiratory system

Frequently asked questions

Code details

Code69979-3

SystemLOINC

Display nameFEF 50%/FIV 50% --pre bronchodilation

DescriptionGas flow at 50% of forced expiration/Gas flow at 50% of forced inspiration^pre bronchodilation

Short nameFEF 50%/FIV 50% pre BD

ComponentGas flow at 50% of forced expiration/Gas flow at 50% of forced inspiration^pre bronchodilation

PropertyRelVRat

TimingPt

System (specimen)Respiratory system

ScaleQn

ClassPULM

Example unitsratio

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.40

Last changed2.48

Part names

Gas flow at 50% of forced expiration/Gas flow at 50% of forced inspiration^pre bronchodilationRelVRatPtRespiratory systemQnRelative Volume RatePoint 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.