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 104831-3: Intercellular substance IgG IF (S) [Titer]

Name: LOINC Code 104831-3: Intercellular substance IgG IF (S) [Titer]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:19.130Z

104831-3 is a LOINC code used to identify Intercellular substance IgG IF (S) [Titer] 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 Intercellular substance 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 Intercellular substance 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
Method: IF

What it does not mean

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

Key facts

Intercellular substance IgG Ab [Titer] in Serum by Immunofluorescence
Intercellular substance Ab.IgG
ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Autoantibodies; Autoantibody; Cell surface; Dilution factor; Dilution Factor (Titer); FA; Fluorescent antibody; Fluoresent; ICS; IFA; Immune fluorescence; Immune globulin G; Immunoflour; Immunofluor; Immunofluorescence; Immunoglobulin G; Intercellular structure; Paraneoplastic pemphigus; Pemphigus; Point in time; Random; Serology; Serum; SmQn; SR; Subs; Time Resolved Fluorescence; Titer; Titered; Titre; TRF; Ttr

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

Intercellular substance IgG IF (S) [Titer]Intercellular substance IgG Ab [Titer] in Serum by ImmunofluorescenceICS IgG Titr Ser IFIntercellular substance Ab.IgGSEROIntercellular substance IgG antibody, BloodTitr

Frequently asked questions

Code details

Code104831-3

SystemLOINC

Display nameIntercellular substance IgG IF (S) [Titer]

DescriptionIntercellular substance Ab.IgG

Short nameICS IgG Titr Ser IF

ComponentIntercellular substance Ab.IgG

PropertyTitr

TimingPt

System (specimen)Ser

ScaleSemiQn

MethodIF

ClassSERO

Example unitstiter

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.78

Last changed2.78

Consumer names

Intercellular substance IgG antibody, Blood

Part names

Intercellular substance Ab.IgGTitrPtSerSemiQnIFIntercellular Substance IgGTiterPoint in time (spot)SerumImmunofluorescence (IF)

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.