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LOINC Code 48773-6: Immunoglobulin light chains.kappa/Immunoglobulin light chains.lambda (CSF) [Mass ratio]

48773-6 is a LOINC code used to identify Immunoglobulin light chains.kappa/Immunoglobulin light chains.lambda (CSF) [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/Immunoglobulin light chains.lambda. It is commonly used with the system or sample type CSF.

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

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: Observation

What it does not mean

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

Key facts

  • Kappa light chains/Lambda light chains [Mass Ratio] in Cerebral spinal fluid
  • Immunoglobulin light chains.kappa/Immunoglobulin light chains.lambda
  • Bence Jones protein; BJ Protein; BJP; Cerebral spinal fluid; Cerebrospinal Fl; Chain; Chemistry; Immune globulin; Immuno; Immunoglob; Immunoglobin; Imunoglbon; Imunoglobn; Kappa LC; Lambda LC; Mass concentration ratio; Mass ratio; MCRto; Point in time; QNT; Quan; Quant; Quantitative; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid

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/Immunoglobulin light chains.lambda (CSF) [Mass ratio]Kappa light chains/Lambda light chains [Mass Ratio] in Cerebral spinal fluidKappa LC/Lambda CSFImmunoglobulin light chains.kappa/Immunoglobulin light chains.lambdaCHEMImmunoglobulin light chains.kappa/Immunoglobulin Light Chains.lambda, Spinal fluidMRto

Frequently asked questions

Code details

Code48773-6
SystemLOINC
Display nameImmunoglobulin light chains.kappa/Immunoglobulin light chains.lambda (CSF) [Mass ratio]
DescriptionImmunoglobulin light chains.kappa/Immunoglobulin light chains.lambda
Short nameKappa LC/Lambda CSF
ComponentImmunoglobulin light chains.kappa/Immunoglobulin light chains.lambda
PropertyMRto
TimingPt
System (specimen)CSF
ScaleQn
ClassCHEM
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.21
Last changed2.63

Consumer names

Immunoglobulin light chains.kappa/Immunoglobulin Light Chains.lambda, Spinal fluid

Part names

Immunoglobulin light chains.kappa/Immunoglobulin light chains.lambdaMRtoPtCSFQnMass RatioPoint in time (spot)Cerebral spinal fluid

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.

LOINC Code 48773-6 | HealthAssure