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LOINC Code 13171-4: Immune complex PEG assay Qn

13171-4 is a LOINC code used to identify Immune complex PEG assay Qn 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 Ser/Plas.

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 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
  • Method: PEG assay

What it does not mean

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

Key facts

  • Immune complex [Units/volume] in Serum or Plasma by Polyethylene glycol (PEG) assay
  • Immune complex
  • Arbitrary concentration; CIC; Circulating immune complex; Compx; IC; Imm; Imun; Imune; Pl; Plasma; Plsm; Point in time; Polyethylene Glycol; QNT; Quan; Quant; Quantitative; Random; Serology; 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

Immune complex PEG assay QnImmune complex [Units/volume] in Serum or Plasma by Polyethylene glycol (PEG) assayIC SerPl PEG-aCncImmune complexSEROImmune complex, BloodACnc

Frequently asked questions

Code details

Code13171-4
SystemLOINC
Display nameImmune complex PEG assay Qn
DescriptionImmune complex
Short nameIC SerPl PEG-aCnc
ComponentImmune complex
PropertyACnc
TimingPt
System (specimen)Ser/Plas
ScaleQn
MethodPEG assay
ClassSERO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0j-a
Last changed2.69

Consumer names

Immune complex, Blood

Part names

Immune complexACncPtSer/PlasQnPEG assayArbitrary ConcentrationPoint in time (spot)Serum or PlasmaPolyethylene 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 13171-4 | HealthAssure