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 14977-3: Immunoglobulin light chains.free Nom (U)

Name: LOINC Code 14977-3: Immunoglobulin light chains.free Nom (U)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

14977-3 is a LOINC code used to identify Immunoglobulin light chains.free Nom (U) 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 Immunoglobulin light chains.free. It is commonly used with the system or sample type Urine.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Immunoglobulin light chains.free. It is commonly used with the system or sample type Urine.

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

Immunoglobulin light chains.free [Type] in Urine
Immunoglobulin light chains.free
Bence Jones protein; BJ Protein; BJ Protein Free; BJP; Chain; Chemistry; FLC; FR; Hematology; Heme; Immune globulin; Immuno; Immunoglob; Immunoglobin; Imunoglbon; Imunoglobn; Nominal; Non-protein bound; Point in time; Random; Typ; UA; UR; Urn

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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Immunoglobulin light chains.free Nom (U) (14977-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Immunoglobulin light chains.free Nom (U)Immunoglobulin light chains.free [Type] in UrineBJ Protein Free UrImmunoglobulin light chains.freeCHEMFree light chains, UrineType

Frequently asked questions

Code details

Code14977-3

SystemLOINC

Display nameImmunoglobulin light chains.free Nom (U)

DescriptionImmunoglobulin light chains.free

Short nameBJ Protein Free Ur

ComponentImmunoglobulin light chains.free

PropertyType

TimingPt

System (specimen)Urine

ScaleNom

ClassCHEM

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0k

Last changed2.26

Consumer names

Free light chains, Urine

Part names

Immunoglobulin light chains.freeTypePtUrineNomPoint in time (spot)

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.