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 12221-8: Heterophile Ab Sheep Cell Agglutination Ql (S)

Name: LOINC Code 12221-8: Heterophile Ab Sheep Cell Agglutination Ql (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:22.975Z

12221-8 is a LOINC code used to identify Heterophile Ab Sheep Cell Agglutination Ql (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 Heterophile Ab. 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 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: Sheep cell aggl

What it does not mean

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

Key facts

Heterophile Ab [Presence] in Serum by Sheep Cell Agglutination
Heterophile Ab
ABS; Aby; Agg; Agglut; Agglutination; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Epstein-Barr virus; Hetero; Heteroph; Hetr; ID; Infectious Disease; InfectiousDisease; Microbiology; Mono screen; Mono slide; Mono spot; Mono test; Mononucleosis screen; Mononucleosis test; Monospot; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Serum; Shp Aggl; 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

Heterophile Ab Sheep Cell Agglutination Ql (S)Heterophile Ab [Presence] in Serum by Sheep Cell AgglutinationHeteroph Ab Ser Ql Shp AgglHeterophile AbMICROHeterophile antibody, BloodPrThr

Frequently asked questions

Code details

Code12221-8

SystemLOINC

Display nameHeterophile Ab Sheep Cell Agglutination Ql (S)

DescriptionHeterophile Ab

Short nameHeteroph Ab Ser Ql Shp Aggl

ComponentHeterophile Ab

PropertyPrThr

TimingPt

System (specimen)Ser

ScaleOrd

MethodSheep cell aggl

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0j-a

Last changed2.73

Consumer names

Heterophile antibody, Blood

Part names

Heterophile AbPrThrPtSerOrdSheep cell agglPresence or ThresholdPoint in time (spot)SerumSheep Cell Agglutination

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.