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.

LOINCActiveObservation

LOINC Code 57665-2: Oligoclonal Bands IgG Isoelectric focusing Ql

Name: LOINC Code 57665-2: Oligoclonal Bands IgG Isoelectric focusing Ql
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.757Z

57665-2 is a LOINC code used to identify Oligoclonal Bands IgG Isoelectric focusing Ql 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 Protein fractions.oligoclonal bands.IgG. 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 Protein fractions.oligoclonal bands.IgG. 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: Observation
Method: Isoelectric focusing

What it does not mean

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

Key facts

Oligoclonal Bands IgG [Presence] in Serum or Plasma by Isoelectric focusing
Protein fractions.oligoclonal bands.IgG
Chemistry; Frac; Fract; Fraction; Fractionated; Fractionation; IEF; Immune globulin G; Immunoglobulin G; M-spikes; Oligoclonal Bands IgG; Ordinal; Pl; Plasma; Plsm; Point in time; PR; Prot; QL; Qual; Qualitative; Random; Screen; 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

Oligoclonal Bands IgG Isoelectric focusing QlOligoclonal Bands IgG [Presence] in Serum or Plasma by Isoelectric focusingOligoclonal Bands IgG SerPl Ql IEFProtein fractions.oligoclonal bands.IgGCHEMOligoclonal bands IgG, BloodPrThr

Frequently asked questions

Code details

Code57665-2

SystemLOINC

Display nameOligoclonal Bands IgG Isoelectric focusing Ql

DescriptionProtein fractions.oligoclonal bands.IgG

Short nameOligoclonal Bands IgG SerPl Ql IEF

ComponentProtein fractions.oligoclonal bands.IgG

PropertyPrThr

TimingPt

System (specimen)Ser/Plas

ScaleOrd

MethodIsoelectric focusing

ClassCHEM

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.29

Last changed2.56

Consumer names

Oligoclonal bands IgG, Blood

Part names

Protein fractions.oligoclonal bands.IgGPrThrPtSer/PlasOrdIsoelectric focusingPresence or ThresholdPoint 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.