LOINC Code 80517-6: Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free Nephelometry (S) [Mass ratio]
80517-6 is a LOINC code used to identify Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free Nephelometry (S) [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.
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.
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
- Method: Nephelometry
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 by Nephelometry
- Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free
- An elevated kappa/lambda ratio supports the diagnosis of a monoclonal gammopathy and requires further investigation. Borderline elevated kappa/lambda ratios occur with renal impairment, and may require appropriate renal function tests. Elevated levels of both kappa and lambda with normal kappa/lambda ratio - may be due to (1) renal impairment (common); (2) Over-production of polyclonal FLC from inflammatory conditions (common); (3) Bi-clonal gammopathies of different free light chain types (rare).
- Bence Jones protein; BJ Protein; BJP; Chain; Chemistry; FR; Hematology; Heme; Immune globulin; Immuno; Immunoglob; Immunoglobin; Imunoglbon; Imunoglobn; Kappa LC; Kappa LC Free; Lambda Free; Lambda LC; Lambda LC Free; Light scattering; Mass concentration ratio; Mass ratio; MCRto; Nephelom; Non-protein bound; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; 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.
Related SNOMED CT concepts
Related observations and tests
Common synonyms
Frequently asked questions
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.