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 9421-9: E. histolytica Ab Immune diff Qn (S)

Name: LOINC Code 9421-9: E. histolytica Ab Immune diff Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

9421-9 is a LOINC code used to identify E. histolytica Ab Immune diff Qn (S) 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 Entamoeba histolytica 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 Entamoeba histolytica 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: Immune diffusion

What it does not mean

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

Key facts

Entamoeba histolytica Ab [Units/volume] in Serum by Immune diffusion (ID)
Entamoeba histolytica Ab
ABS; Aby; Ameba; Amebiasis; Amebic; Amoeba; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; E histolyt; E histolytica; ID; Imm; Immunodiff; Immunodiffusion; Imun; Imune; Infectious Disease; InfectiousDisease; Microbiology; 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for E. histolytica Ab Immune diff Qn (S) (9421-9)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

E. histolytica Ab Immune diff Qn (S)Entamoeba histolytica Ab [Units/volume] in Serum by Immune diffusion (ID)E histolyt Ab Ser ID-aCncEntamoeba histolytica AbMICROEntamoeba histolytica antibody, BloodACnc

Frequently asked questions

Code details

Code9421-9

SystemLOINC

Display nameE. histolytica Ab Immune diff Qn (S)

DescriptionEntamoeba histolytica Ab

Short nameE histolyt Ab Ser ID-aCnc

ComponentEntamoeba histolytica Ab

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodImmune diffusion

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0i

Last changed2.73

Consumer names

Entamoeba histolytica antibody, Blood

Part names

Entamoeba histolytica AbACncPtSerQnImmune diffusionArbitrary ConcentrationPoint in time (spot)SerumImmune diffusion (ID)

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.