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 56357-7: Perennial rye grass IgG4 (S) [Mass/Vol]

Name: LOINC Code 56357-7: Perennial rye grass IgG4 (S) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.260Z

56357-7 is a LOINC code used to identify Perennial rye grass IgG4 (S) [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 Ab.IgG4. It is commonly used with the system or sample type Ser.

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 Ab.IgG4. It is commonly used with the system or sample type Ser.

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 IgG4 Ab [Mass/volume] in Serum
Lolium perenne Ab.IgG4
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; g005; g5; Italian Ryegrass; Level; Mass concentration; Per rye grass; Perennial ryegrass; Point in time; QNT; Quan; Quant; Quantitative; Random; Rye grass; Ryegrass; Serum; SR

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 IgG4 (S) [Mass/Vol]Perennial rye grass IgG4 Ab [Mass/volume] in SerumPer rye grass IgG4-mCncLolium perenne Ab.IgG4ALLERGYPerennial rye grass IgG4 antibodyMCnc

Frequently asked questions

Code details

Code56357-7

SystemLOINC

Display namePerennial rye grass IgG4 (S) [Mass/Vol]

DescriptionLolium perenne Ab.IgG4

Short namePer rye grass IgG4-mCnc

ComponentLolium perenne Ab.IgG4

PropertyMCnc

TimingPt

System (specimen)Ser

ScaleQn

ClassALLERGY

Example unitsug/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.29

Last changed2.70

Consumer names

Perennial rye grass IgG4 antibody

Part names

Lolium perenne Ab.IgG4MCncPtSerQnPerennial rye grass (Lolium perenne) IgG4Mass ConcentrationPoint in time (spot)Serum

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.