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.

LOINCActiveBoth

LOINC Code 91981-1: Airway resistance measured/predicted by Plethysmograph body box

Name: LOINC Code 91981-1: Airway resistance measured/predicted by Plethysmograph body box
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:21.442Z

91981-1 is a LOINC code used to identify Airway resistance measured/predicted by Plethysmograph body box 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 Resistance.airway/predicted. 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 Resistance.airway/predicted. 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: Both
Method: Plethysmograph.body box

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Airway resistance measured/predicted by Plethysmograph body box
Resistance.airway/predicted
Airway resist; Average; Avg; bod; Bodies; Breathing; Lungs; PULMONARY; QNT; Quan; Quant; Quantitative; RAW; Resist; Resistanc; Resistant; Resistent; RS; Studies; Study; Sutdies

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

Airway resistance measured/predicted by Plethysmograph body boxAirway resist meas/pred PlethysmographyResistance.airway/predictedPULMRelFldResistStdy^meanRespiratory system.airway

Frequently asked questions

Code details

Code91981-1

SystemLOINC

Display nameAirway resistance measured/predicted by Plethysmograph body box

DescriptionResistance.airway/predicted

Short nameAirway resist meas/pred Plethysmography

ComponentResistance.airway/predicted

PropertyRelFldResist

TimingStdy^mean

System (specimen)Respiratory system.airway

ScaleQn

MethodPlethysmograph.body box

ClassPULM

Example units%

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.66

Last changed2.66

Part names

Resistance.airway/predictedRelFldResistStdy^meanRespiratory system.airwayQnPlethysmograph.body boxRelative Fluid ResistanceRespiratory system airwayPlethysmograph body box

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.