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 74522-4: Complement lectin pathway actual/normal IA (S) [Rel units/Vol]

Name: LOINC Code 74522-4: Complement lectin pathway actual/normal IA (S) [Rel units/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:53.976Z

74522-4 is a LOINC code used to identify Complement lectin pathway actual/normal IA (S) [Rel units/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 Complement lectin pathway actual/normal. It is commonly used with the system or sample type Ser.

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 lectin pathway actual/normal. It is commonly used with the system or sample type Ser.

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: IA

What it does not mean

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

Key facts

Complement lectin pathway actual/normal in Serum by Immunoassay
Complement lectin pathway actual/normal
Act/Nor; Comp; Comp activity.lectin; Complement functional activity.lectin pathway; Complement screening; Complmt; Control; EIA; ELFA; ELISA; Enzyme immunoassay; HEMATOLOGY/CELL COUNTS; IAA; MBL; MEIA; Point in time; QNT; Quan; Quant; Quantitative; Random; RlACnc; Serum; SR; SUDS

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 lectin pathway actual/normal IA (S) [Rel units/Vol]Complement lectin pathway actual/normal in Serum by ImmunoassayComp activity.lectin Act/Nor Ser IAComplement lectin pathway actual/normalHEM/BCComplement lectin pathway actual/normal, BloodRelACnc

Frequently asked questions

Code details

Code74522-4

SystemLOINC

Display nameComplement lectin pathway actual/normal IA (S) [Rel units/Vol]

DescriptionComplement lectin pathway actual/normal

Short nameComp activity.lectin Act/Nor Ser IA

ComponentComplement lectin pathway actual/normal

PropertyRelACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIA

ClassHEM/BC

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.48

Last changed2.56

Consumer names

Complement lectin pathway actual/normal, Blood

Part names

Complement lectin pathway actual/normalRelACncPtSerQnIARelative Arbitrary ConcentrationPoint in time (spot)SerumImmunoassay

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.