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 15169-6: Complement total hemolytic C50 IA Qn

Name: LOINC Code 15169-6: Complement total hemolytic C50 IA Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:25.112Z

15169-6 is a LOINC code used to identify Complement total hemolytic C50 IA 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 total hemolytic C50. 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 total hemolytic C50. 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: IA

What it does not mean

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

Key facts

Complement total hemolytic C50 [Units/volume] in Serum or Plasma by Immunoassay
Complement total hemolytic C50
Arbitrary concentration; Comp; Comp C50; Complmt; EIA; ELFA; ELISA; Enzyme immunoassay; HEMATOLOGY/CELL COUNTS; IAA; MEIA; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; SUDS; Tot; Total Hem Comp; Totl

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 total hemolytic C50 IA QnComplement total hemolytic C50 [Units/volume] in Serum or Plasma by ImmunoassayComp C50 SerPl IA-aCncComplement total hemolytic C50HEM/BCComplement Total Hemolytic C50, BloodACnc

Frequently asked questions

Code details

Code15169-6

SystemLOINC

Display nameComplement total hemolytic C50 IA Qn

DescriptionComplement total hemolytic C50

Short nameComp C50 SerPl IA-aCnc

ComponentComplement total hemolytic C50

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

MethodIA

ClassHEM/BC

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0k

Last changed2.73

Consumer names

Complement Total Hemolytic C50, Blood

Part names

Complement total hemolytic C50ACncPtSer/PlasQnIAArbitrary ConcentrationPoint in time (spot)Serum or PlasmaImmunoassay

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.