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LOINC Code 104546-7: Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free [Mass ratio]

104546-7 is a LOINC code used to identify Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free [Mass ratio] 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.kappa.free/Immunoglobulin light chains.lambda.free. It is commonly used with the system or sample type Ser/Plas.

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 Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free. It is commonly used with the system or sample type Ser/Plas.

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

  • Kappa light chains.free/Lambda light chains.free [Mass Ratio] in Serum or Plasma
  • Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free
  • Bence Jones protein; BJ Protein; BJP; Chain; Chemistry; FR; Immune globulin; Immuno; Immunoglob; Immunoglobin; Imunoglbon; Imunoglobn; Kappa LC; Kappa LC Free; Lambda Free; Lambda LC; Lambda LC Free; Mass concentration ratio; Mass ratio; MCRto; Non-protein bound; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; 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

Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free [Mass ratio]Kappa light chains.free/Lambda light chains.free [Mass Ratio] in Serum or PlasmaKappa LC Free/Lambda Free SerPlImmunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.freeCHEMFree kappa light chains/Free Lambda Light Chains, BloodMRto

Frequently asked questions

Code details

Code104546-7
SystemLOINC
Display nameImmunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free [Mass ratio]
DescriptionImmunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free
Short nameKappa LC Free/Lambda Free SerPl
ComponentImmunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free
PropertyMRto
TimingPt
System (specimen)Ser/Plas
ScaleQn
ClassCHEM
Example units{ratio}
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.78
Last changed2.78

Consumer names

Free kappa light chains/Free Lambda Light Chains, Blood

Part names

Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.freeMRtoPtSer/PlasQnMass RatioPoint in time (spot)Serum or Plasma

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.