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LOINC Code 23881-6: Immune complex PEG assay (Body fld) [Mass/Vol]

23881-6 is a LOINC code used to identify Immune complex PEG assay (Body fld) [Mass/Vol] 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 Immune complex. It is commonly used with the system or sample type Body fld.

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 Immune complex. It is commonly used with the system or sample type Body fld.

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
  • Method: PEG assay

What it does not mean

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

Key facts

  • Immune complex [Mass/volume] in Body fluid by Polyethylene glycol (PEG) assay
  • Immune complex
  • B/F; BF; bod; Bodies; Body fluid; Body fluid, unsp; CIC; Circulating immune complex; Compx; Fl; Fld; FLU; Fluid; IC; Imm; Imun; Imune; Level; Mass concentration; Point in time; Polyethylene Glycol; QNT; Quan; Quant; Quantitative; Random; Serology

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

Immune complex PEG assay (Body fld) [Mass/Vol]Immune complex [Mass/volume] in Body fluid by Polyethylene glycol (PEG) assayIC Fld PEG-mCncImmune complexSEROImmune complex, Body fluidMCnc

Frequently asked questions

Code details

Code23881-6
SystemLOINC
Display nameImmune complex PEG assay (Body fld) [Mass/Vol]
DescriptionImmune complex
Short nameIC Fld PEG-mCnc
ComponentImmune complex
PropertyMCnc
TimingPt
System (specimen)Body fld
ScaleQn
MethodPEG assay
ClassSERO
Example unitsug/mL
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0n
Last changed2.42

Consumer names

Immune complex, Body fluid

Part names

Immune complexMCncPtBody fldQnPEG assayMass ConcentrationPoint in time (spot)Body fluidPolyethylene glycol (PEG) assay

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 23881-6 | HealthAssure