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.

LOINCBoth

LOINC Code 3266-4: Heparin Ab Platelet aggregation (PPP) [Threshold]

Name: LOINC Code 3266-4: Heparin Ab Platelet aggregation (PPP) [Threshold]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

3266-4 is a LOINC code used to identify Heparin Ab Platelet aggregation (PPP) [Threshold] 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 Heparin Ab. It is commonly used with the system or sample type PPP.

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 Heparin Ab. It is commonly used with the system or sample type PPP.

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: DEPRECATED
Order vs observation: Both
Method: Platelet aggr

What it does not mean

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

Key facts

Deprecated Heparin Ab [Threshold] in Platelet poor plasma by Platelet aggregation
Heparin Ab
ABS; Aby; Agg; Aggreg; Aggregation; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; COAGULATION; HATT; Hematology; Heme; Hep; Hepar; Heparn; HIT; HITT; Pl Agg; Plas; Platelet poor plasma; Point in time; QNT; Quan; Quant; Quantitative; Random; Thrombocyte; Thrombocytes

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 Heparin Ab Platelet aggregation (PPP) [Threshold] (3266-4)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Heparin Ab Platelet aggregation (PPP) [Threshold]Deprecated Heparin Ab [Threshold] in Platelet poor plasma by Platelet aggregationDeprecated Heparin Ab PPP Qn Pl AggHeparin AbCOAGHeparin antibody, BloodThreshold

Frequently asked questions

Code details

Code3266-4

SystemLOINC

Display nameHeparin Ab Platelet aggregation (PPP) [Threshold]

DescriptionHeparin Ab

Short nameDeprecated Heparin Ab PPP Qn Pl Agg

ComponentHeparin Ab

PropertyThreshold

TimingPt

System (specimen)PPP

ScaleQn

MethodPlatelet aggr

ClassCOAG

StatusDEPRECATED

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.65

Consumer names

Heparin antibody, Blood

Part names

Heparin AbThresholdPtPPPQnPlatelet aggrPoint in time (spot)Platelet poor plasmaPlatelet aggregation

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.