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 56181-1: A. niger IgG4 (S) [Mass/Vol]

Name: LOINC Code 56181-1: A. niger IgG4 (S) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:37.767Z

56181-1 is a LOINC code used to identify A. niger 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 Aspergillus niger 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 Aspergillus niger 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

Aspergillus niger IgG4 Ab [Mass/volume] in Serum
Aspergillus niger Ab.IgG4
A niger; ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Asperg; Aspergil; Aspergilis; Aspergilla; Aspergillin; Aspergillosis; Aspergils; Aspergilus; Autoantibodies; Autoantibody; Farmers lung; Level; m207; Mass concentration; Point in time; QNT; Quan; Quant; Quantitative; Random; 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

A. niger IgG4 (S) [Mass/Vol]Aspergillus niger IgG4 Ab [Mass/volume] in SerumA niger IgG4-mCncAspergillus niger Ab.IgG4ALLERGYAspergillus niger IgG4 antibodyMCnc

Frequently asked questions

Code details

Code56181-1

SystemLOINC

Display nameA. niger IgG4 (S) [Mass/Vol]

DescriptionAspergillus niger Ab.IgG4

Short nameA niger IgG4-mCnc

ComponentAspergillus niger 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

Aspergillus niger IgG4 antibody

Part names

Aspergillus niger Ab.IgG4MCncPtSerQnAspergillus niger 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.