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 48261-2: Perennial rye grass triggered leukotriene release (WBC) [Mass/Vol]

Name: LOINC Code 48261-2: Perennial rye grass triggered leukotriene release (WBC) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:33.165Z

48261-2 is a LOINC code used to identify Perennial rye grass triggered leukotriene release (WBC) [Mass/Vol] 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 Lolium perenne leukotriene release. It is commonly used with the system or sample type WBC.

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 Lolium perenne leukotriene release. It is commonly used with the system or sample type WBC.

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

What it does not mean

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

Key facts

Perennial rye grass triggered leukotriene release [Mass/volume] by Leukocytes
Lolium perenne leukotriene release
Allergen; Allergens; ALLERGY TESTING; CAST; g005; g5; Italian Ryegrass; Leukocytes; Level; LR; Mass Concentration; Per rye grass; Perennial ryegrass; Point in time; QNT; Quan; Quant; Quantitative; Random; Rye grass; Ryegrass; WBCs; White blood cells

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

Perennial rye grass triggered leukotriene release (WBC) [Mass/Vol]Perennial rye grass triggered leukotriene release [Mass/volume] by LeukocytesPer rye grass LR-mCncLolium perenne leukotriene releaseALLERGYPerennial rye grass triggered leukotriene release, White blood cellsMCnc

Frequently asked questions

Code details

Code48261-2

SystemLOINC

Display namePerennial rye grass triggered leukotriene release (WBC) [Mass/Vol]

DescriptionLolium perenne leukotriene release

Short namePer rye grass LR-mCnc

ComponentLolium perenne leukotriene release

PropertyMCnc

TimingPt

System (specimen)WBC

ScaleQn

ClassALLERGY

Example unitspg/mL sLT

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.21

Last changed2.70

Consumer names

Perennial rye grass triggered leukotriene release, White blood cells

Part names

Lolium perenne leukotriene releaseMCncPtWBCQnMass ConcentrationPoint in time (spot)White blood cells

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.