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 6424-6: Heterophile Ab Aggl (S) [Titer]

Name: LOINC Code 6424-6: Heterophile Ab Aggl (S) [Titer]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

6424-6 is a LOINC code used to identify Heterophile Ab Aggl (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 Heterophile Ab. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Heterophile Ab. 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: Aggl

What it does not mean

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

Key facts

Heterophile Ab [Titer] in Serum by Agglutination
Heterophile Ab
ABS; Aby; Agg; Agglut; Agglutination; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Dilution factor; Dilution Factor (Titer); Epstein-Barr virus; Hetero; Heteroph; Hetr; ID; Infectious Disease; InfectiousDisease; Microbiology; Mono screen; Mono slide; Mono spot; Mono test; Mononucleosis screen; Mononucleosis test; Monospot; Point in time; Random; Serum; SmQn; SR; Titer; Titered; Titre; 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Heterophile Ab Aggl (S) [Titer] (6424-6)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Heterophile Ab Aggl (S) [Titer]Heterophile Ab [Titer] in Serum by AgglutinationHeteroph Ab Titr Ser AgglHeterophile AbMICROHeterophile antibody, BloodTitr

Frequently asked questions

Code details

Code6424-6

SystemLOINC

Display nameHeterophile Ab Aggl (S) [Titer]

DescriptionHeterophile Ab

Short nameHeteroph Ab Titr Ser Aggl

ComponentHeterophile Ab

PropertyTitr

TimingPt

System (specimen)Ser

ScaleSemiQn

MethodAggl

ClassMICRO

Example unitstiter

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0f

Last changed2.75

Consumer names

Heterophile antibody, Blood

Part names

Heterophile AbTitrPtSerSemiQnAgglTiterPoint in time (spot)SerumAgglutination

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.