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 3181-5: Cardiolipin IgG IA Qn (S)

Name: LOINC Code 3181-5: Cardiolipin IgG IA Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:18.898Z

3181-5 is a LOINC code used to identify Cardiolipin IgG IA 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 Cardiolipin Ab.IgG. 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 Cardiolipin Ab.IgG. 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: IA

What it does not mean

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

Key facts

Cardiolipin IgG Ab [Units/volume] in Serum by Immunoassay
Cardiolipin Ab.IgG
ABS; Aby; ACA; aCL; Antby; Anti; Antibodies; Antibody; Anticardiolipin; Arbitrary concentration; Autoantibodies; Autoantibody; Cardio; Cardiolip; Cardiolipn; Cardiolpn; CL; COAGULATION; EIA; ELFA; ELISA; Enzyme immunoassay; Hematology; Heme; IAA; Immune globulin G; Immunoglobulin G; MEIA; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SR; SUDS; UniversalLabOrders

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

Cardiolipin IgG IA Qn (S)Cardiolipin IgG Ab [Units/volume] in Serum by ImmunoassayCardiolipin IgG Ser IA-aCncCardiolipin Ab.IgGCOAGCardiolipin IgG antibody, BloodACnc

Frequently asked questions

Code details

Code3181-5

SystemLOINC

Display nameCardiolipin IgG IA Qn (S)

DescriptionCardiolipin Ab.IgG

Short nameCardiolipin IgG Ser IA-aCnc

ComponentCardiolipin Ab.IgG

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIA

ClassCOAG

Example unitsGPL U

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Cardiolipin IgG antibody, Blood

Part names

Cardiolipin Ab.IgGACncPtSerQnIACardiolipin IgGArbitrary ConcentrationPoint in time (spot)SerumImmunoassay

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.