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 56398-1: Sweet Vernal grass IgG4 (S) [Mass/Vol]

Name: LOINC Code 56398-1: Sweet Vernal grass IgG4 (S) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.260Z

56398-1 is a LOINC code used to identify Sweet Vernal 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 Anthoxanthum odoratum 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 Anthoxanthum odoratum 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

Sweet Vernal grass IgG4 Ab [Mass/volume] in Serum
Anthoxanthum odoratum Ab.IgG4
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; g001; g1; Level; Mass concentration; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SR; Sw Vernal grass; Sweet vernal grass

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

Sweet Vernal grass IgG4 (S) [Mass/Vol]Sweet Vernal grass IgG4 Ab [Mass/volume] in SerumSw Vernal grass IgG4-mCncAnthoxanthum odoratum Ab.IgG4ALLERGYSweet vernal grass IgG4 antibodyMCnc

Frequently asked questions

Code details

Code56398-1

SystemLOINC

Display nameSweet Vernal grass IgG4 (S) [Mass/Vol]

DescriptionAnthoxanthum odoratum Ab.IgG4

Short nameSw Vernal grass IgG4-mCnc

ComponentAnthoxanthum odoratum 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 changed2.73

Consumer names

Sweet vernal grass IgG4 antibody

Part names

Anthoxanthum odoratum Ab.IgG4MCncPtSerQnSweet Vernal grass (Anthoxanthum odoratum) 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.