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 35540-4: Mushroom IgG (S) [Mass/Vol]

Name: LOINC Code 35540-4: Mushroom IgG (S) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:23.498Z

35540-4 is a LOINC code used to identify Mushroom IgG (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 Agaricus hortensis Ab.IgG. 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 Agaricus hortensis Ab.IgG. 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

Mushroom IgG Ab [Mass/volume] in Serum
Agaricus hortensis Ab.IgG
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Champignon; f212; Immune globulin G; Immunoglobulin G; Level; Mass concentration; Mushroom; Mushrooms; Point in time; QNT; Quan; Quant; Quantitative; Random; Rf212; 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

Mushroom IgG (S) [Mass/Vol]Mushroom IgG Ab [Mass/volume] in SerumMushroom IgG-mCncAgaricus hortensis Ab.IgGALLERGYMushroom IgG antibodyMCnc

Frequently asked questions

Code details

Code35540-4

SystemLOINC

Display nameMushroom IgG (S) [Mass/Vol]

DescriptionAgaricus hortensis Ab.IgG

Short nameMushroom IgG-mCnc

ComponentAgaricus hortensis Ab.IgG

PropertyMCnc

TimingPt

System (specimen)Ser

ScaleQn

ClassALLERGY

Example unitsug/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.13

Last changed2.73

Consumer names

Mushroom IgG antibody

Part names

Agaricus hortensis Ab.IgGMCncPtSerQnMushroom (Agaricus hortensis) IgGMass 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.