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 18323-6: Smith extractable nuclear IgG Qn (S)

Name: LOINC Code 18323-6: Smith extractable nuclear IgG Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:27.587Z

18323-6 is a LOINC code used to identify Smith extractable nuclear IgG 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 Smith extractable nuclear 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 Smith extractable nuclear 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

What it does not mean

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

Key facts

Smith extractable nuclear IgG Ab [Units/volume] in Serum
Smith extractable nuclear Ab.IgG
ABS; Aby; ANA; ANA IgG; ANF; Antby; Anti; Antibodies; Antibody; Antinuclear antibody; Arbitrary concentration; Autoantibodies; Autoantibody; ENA; ENA SM; Immune globulin G; Immunoglobulin G; NA; Nuc; Point in time; QNT; Quan; Quant; Quantitative; Random; Serology; Serum; SM; 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

Smith extractable nuclear IgG Qn (S)Smith extractable nuclear IgG Ab [Units/volume] in SerumENA SM IgG Ser-aCncSmith extractable nuclear Ab.IgGSEROSmith extractable nuclear IgG antibody, BloodACnc

Frequently asked questions

Code details

Code18323-6

SystemLOINC

Display nameSmith extractable nuclear IgG Qn (S)

DescriptionSmith extractable nuclear Ab.IgG

Short nameENA SM IgG Ser-aCnc

ComponentSmith extractable nuclear Ab.IgG

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

ClassSERO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.73

Consumer names

Smith extractable nuclear IgG antibody, Blood

Part names

Smith extractable nuclear Ab.IgGACncPtSerQnSmith extractable nuclear IgGArbitrary ConcentrationPoint in time (spot)Serum

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.