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 3228-4: Coagulation factor XI Ag IA Qn (PPP)

Name: LOINC Code 3228-4: Coagulation factor XI Ag IA Qn (PPP)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:18.900Z

3228-4 is a LOINC code used to identify Coagulation factor XI Ag IA Qn (PPP) 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 Coagulation factor XI Ag. It is commonly used with the system or sample type PPP.

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 Coagulation factor XI Ag. 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: ACTIVE
Order vs observation: Both
Method: IA

What it does not mean

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

Key facts

Coagulation factor XI Ag [Units/volume] in Platelet poor plasma by Immunoassay
Coagulation factor XI Ag
Antigen; Antigens; Antihemophilic factor C; Arbitrary concentration; Coag; EIA; ELFA; ELISA; Enzyme immunoassay; Fac; Fact; Fact XI; Factor 11; FXI; Hematology; Heme; IAA; MEIA; Plas; Plasma thromboplastin antecedent; Platelet poor plasma; Point in time; PTA; QNT; Quan; Quant; Quantitative; Random; SUDS

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

Coagulation factor XI Ag IA Qn (PPP)Coagulation factor XI Ag [Units/volume] in Platelet poor plasma by ImmunoassayFact XI Ag PPP IA-aCncCoagulation factor XI AgCOAGCoagulation Factor XI antigen, BloodACnc

Frequently asked questions

Code details

Code3228-4

SystemLOINC

Display nameCoagulation factor XI Ag IA Qn (PPP)

DescriptionCoagulation factor XI Ag

Short nameFact XI Ag PPP IA-aCnc

ComponentCoagulation factor XI Ag

PropertyACnc

TimingPt

System (specimen)PPP

ScaleQn

MethodIA

ClassCOAG

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Coagulation Factor XI antigen, Blood

Part names

Coagulation factor XI AgACncPtPPPQnIAArbitrary ConcentrationPoint in time (spot)Platelet poor plasmaImmunoassay

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.