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 5178-9: H. influenzae Ab IA Qn (S)

Name: LOINC Code 5178-9: H. influenzae Ab IA Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:35.013Z

5178-9 is a LOINC code used to identify H. influenzae Ab IA Qn (S) 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 Haemophilus influenzae Ab. 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 Haemophilus influenzae Ab. 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: Both
Method: IA

What it does not mean

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

Key facts

Haemophilus influenzae Ab [Units/volume] in Serum by Immunoassay
Haemophilus influenzae Ab
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; EIA; ELFA; ELISA; Enzyme immunoassay; H flu; H influenza; H influenzae; Haem influ; Haemoph; IAA; ID; Infectious Disease; InfectiousDisease; Influ; MEIA; Microbiology; Point in time; QNT; Quan; Quant; Quantitative; Random; 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

H. influenzae Ab IA Qn (S)Haemophilus influenzae Ab [Units/volume] in Serum by ImmunoassayHaem influ Ab Ser IA-aCncHaemophilus influenzae AbMICROHaemophilus influenzae antibody, BloodACnc

Frequently asked questions

Code details

Code5178-9

SystemLOINC

Display nameH. influenzae Ab IA Qn (S)

DescriptionHaemophilus influenzae Ab

Short nameHaem influ Ab Ser IA-aCnc

ComponentHaemophilus influenzae Ab

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIA

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Haemophilus influenzae antibody, Blood

Part names

Haemophilus influenzae AbACncPtSerQnIAArbitrary 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.