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.

LOINCActiveBoth

LOINC Code 4471-9: Complement Activity Cell Surface Induced Qn

Name: LOINC Code 4471-9: Complement Activity Cell Surface Induced Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:30.173Z

4471-9 is a LOINC code used to identify Complement Activity Cell Surface Induced 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 Complement activity.cell surface induced. 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 Complement activity.cell surface induced. 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

What it does not mean

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

Key facts

Complement Activity Cell Surface Induced [Units/volume] in Serum or Plasma
Complement activity.cell surface induced
Hemolytic complement titer alternative system
Activ; Actvty; Arbitrary concentration; Comp; Comp Actv Surf Ind; Complmt; HEMATOLOGY/CELL COUNTS; Movements; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Surf

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

Complement Activity Cell Surface Induced QnComplement Activity Cell Surface Induced [Units/volume] in Serum or PlasmaComp Actv Surf Ind SerPl-aCncComplement activity.cell surface inducedHEM/BCComplement activity cell surface induced, BloodACnc

Frequently asked questions

Code details

Code4471-9

SystemLOINC

Display nameComplement Activity Cell Surface Induced Qn

DescriptionComplement activity.cell surface induced

Short nameComp Actv Surf Ind SerPl-aCnc

ComponentComplement activity.cell surface induced

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassHEM/BC

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.69

Consumer names

Complement activity cell surface induced, Blood

Part names

Complement activity.cell surface inducedACncPtSer/PlasQnComplement Activity Cell Surface InducedArbitrary ConcentrationPoint 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.