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 69983-5: FEV1 percent change

Name: LOINC Code 69983-5: FEV1 percent change
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:48.867Z

69983-5 is a LOINC code used to identify FEV1 percent change 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 Volume expired during 1.0 s of forced expiration percent change. 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 Volume expired during 1.0 s of forced expiration percent change. 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

FEV1 percent change
Volume expired during 1.0 s of forced expiration percent change
Breathing; End tidal volume; Exchange; Exp; FEV; FEV1; FEV1 % change; Forced expiratory volume in 1 second; Lung; Lungs; Point in time; PULMONARY; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Replace; Respiratory; RS; S prime; Vet; Vol; Vol exp

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

FEV1 percent changeFEV1 % changeVolume expired during 1.0 s of forced expiration percent changePULMVPctDiffPtRespiratory system

Frequently asked questions

Code details

Code69983-5

SystemLOINC

Display nameFEV1 percent change

DescriptionVolume expired during 1.0 s of forced expiration percent change

Short nameFEV1 % change

ComponentVolume expired during 1.0 s of forced expiration percent change

PropertyVPctDiff

TimingPt

System (specimen)Respiratory system

ScaleQn

ClassPULM

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.40

Last changed2.73

Part names

Volume expired during 1.0 s of forced expiration percent changeVPctDiffPtRespiratory systemQnFEV1 percent changeVolume Percent DifferencePoint 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.