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 54157-3: RNA polymerase I Ab IF (S) [Titer]

Name: LOINC Code 54157-3: RNA polymerase I Ab IF (S) [Titer]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:36.582Z

54157-3 is a LOINC code used to identify RNA polymerase I Ab IF (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 RNA polymerase I 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 RNA polymerase I 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

What it does not mean

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

Key facts

RNA polymerase I Ab [Titer] in Serum by Immunofluorescence
RNA polymerase I Ab
ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Autoantibodies; Autoantibody; Dilution factor; Dilution Factor (Titer); FA; Fluorescent antibody; Fluoresent; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Point in time; Pol I; Random; Ribonucleic acid; RNAp I; 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

RNA polymerase I Ab IF (S) [Titer]RNA polymerase I Ab [Titer] in Serum by ImmunofluorescenceRNAp I Ab Titr Ser IFRNA polymerase I AbSERORNA Polymerase I antibody, BloodTitr

Frequently asked questions

Code details

Code54157-3

SystemLOINC

Display nameRNA polymerase I Ab IF (S) [Titer]

DescriptionRNA polymerase I Ab

Short nameRNAp I Ab Titr Ser IF

ComponentRNA polymerase I Ab

PropertyTitr

TimingPt

System (specimen)Ser

ScaleSemiQn

MethodIF

ClassSERO

Example unitsTiter

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.27

Last changed2.75

Consumer names

RNA Polymerase I antibody, Blood

Part names

RNA polymerase I AbTitrPtSerSemiQnIFTiterPoint 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.