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 44391-1: Immune complex C1q binding assay Ql

Name: LOINC Code 44391-1: Immune complex C1q binding assay Ql
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

44391-1 is a LOINC code used to identify Immune complex C1q binding assay 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 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: C1q binding assay

What it does not mean

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

Key facts

Immune complex [Presence] in Serum or Plasma by C1q binding assay
Immune complex
Bind; CIC; Circulating immune complex; Compx; IC; Imm; Imun; Imune; Ordinal; Pl; Plasma; Plsm; Point in time; PR; QL; Qual; Qualitative; Random; Screen; 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Immune complex C1q binding assay Ql (44391-1)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Immune complex C1q binding assay QlImmune complex [Presence] in Serum or Plasma by C1q binding assayIC SerPl Ql C1Q BindImmune complexSEROImmune complex, BloodPrThr

Frequently asked questions

Code details

Code44391-1

SystemLOINC

Display nameImmune complex C1q binding assay Ql

DescriptionImmune complex

Short nameIC SerPl Ql C1Q Bind

ComponentImmune complex

PropertyPrThr

TimingPt

System (specimen)Ser/Plas

ScaleOrd

MethodC1q binding assay

ClassSERO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.17

Last changed2.73

Consumer names

Immune complex, Blood

Part names

Immune complexPrThrPtSer/PlasOrdC1q binding assayPresence 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.