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 21424-7: Nuclear IgG IF Ql (S)

Name: LOINC Code 21424-7: Nuclear IgG IF Ql (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:29.461Z

21424-7 is a LOINC code used to identify Nuclear IgG IF 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 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 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
Method: IF

What it does not mean

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

Key facts

Nuclear IgG Ab [Presence] in Serum by Immunofluorescence
Nuclear Ab.IgG
ABS; Aby; ACIF; ANA; ANA IgG; ANF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Antinuclear antibody; Autoantibodies; Autoantibody; FA; FANA; Fluorescent antibody; Fluoresent; IFA; Immune fluorescence; Immune globulin G; Immunoflour; Immunofluor; Immunofluorescence; Immunoglobulin G; NA; Nuc; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Serology; Serum; SR; Time Resolved Fluorescence; TRF

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

Nuclear IgG IF Ql (S)Nuclear IgG Ab [Presence] in Serum by ImmunofluorescenceNuclear IgG Ser Ql IFNuclear Ab.IgGSERONuclear IgG antibody, BloodPrThr

Frequently asked questions

Code details

Code21424-7

SystemLOINC

Display nameNuclear IgG IF Ql (S)

DescriptionNuclear Ab.IgG

Short nameNuclear IgG Ser Ql IF

ComponentNuclear Ab.IgG

PropertyPrThr

TimingPt

System (specimen)Ser

ScaleOrd

MethodIF

ClassSERO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.73

Consumer names

Nuclear IgG antibody, Blood

Part names

Nuclear Ab.IgGPrThrPtSerOrdIFNuclear IgGPresence or ThresholdPoint in time (spot)SerumImmunofluorescence (IF)

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.