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 21423-9: Nuclear Ab IF rat liver (S) [Titer]

Name: LOINC Code 21423-9: Nuclear Ab IF rat liver (S) [Titer]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:29.461Z

21423-9 is a LOINC code used to identify Nuclear Ab IF rat liver (S) [Titer] 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. 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. 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 rat liver substrate

What it does not mean

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

Key facts

Nuclear Ab [Titer] in Serum by Immunofluorescence (IF) rat liver
Nuclear Ab
ABS; Aby; ACIF; ANA; ANF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Antinuclear antibody; Autoantibodies; Autoantibody; Dilution factor; Dilution Factor (Titer); FA; FANA; Fluorescent antibody; Fluoresent; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; NA; Nuc; Point in time; Random; Serology; Serum; SmQn; SR; Time Resolved Fluorescence; Titer; Titered; Titre; TRF; Ttr

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 Ab IF rat liver (S) [Titer]Nuclear Ab [Titer] in Serum by Immunofluorescence (IF) rat liverANA Titr Ser IF Rat LivNuclear AbSERONuclear antibody, BloodTitr

Frequently asked questions

Code details

Code21423-9

SystemLOINC

Display nameNuclear Ab IF rat liver (S) [Titer]

DescriptionNuclear Ab

Short nameANA Titr Ser IF Rat Liv

ComponentNuclear Ab

PropertyTitr

TimingPt

System (specimen)Ser

ScaleSemiQn

MethodIF rat liver substrate

ClassSERO

Example unitstiter

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.75

Consumer names

Nuclear antibody, Blood

Part names

Nuclear AbTitrPtSerSemiQnIF rat liver substrateTiterPoint in time (spot)SerumImmunofluorescence (IF) rat liver

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.