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: Haemophilus influenzae Antigen Detection, Qualitative, Culture

Published: August 9, 2026Updated: August 16, 2026

: This test checks a culture sample for antigens from Haemophilus influenzae, a bacterium that can cause respiratory and other infections.

Quick summary

[": A positive result means H. influenzae antigens were detected in the cultured sample."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
88901-4
Short code
HAdV Stl Ql Cult
Synonyms
HAdV Stl Ql Cult
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

: What Is Haemophilus influenzae?

: Haemophilus influenzae is a type of bacteria that can live harmlessly in the nose and throat but can also cause infections of the ears, sinuses, lungs, and, less commonly, the blood or brain.

: How the Test Works

: A sample, often a respiratory specimen, is cultured and then tested for antigens that are specific to Haemophilus influenzae; this helps identify the bacterium when it is present.

: Why Your Clinician Ordered It

: Your clinician may order this test to help confirm whether Haemophilus influenzae is contributing to an infection, especially when a culture is being done.

: What the Result Means

: A detected (positive) result suggests Haemophilus influenzae antigens are present in the sample, while a not-detected (negative) result suggests they were not found; results are interpreted alongside symptoms and other tests.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

: H. influenzae Antigen (Culture)

Frequently asked questions

: Does a positive result always mean I have an infection?
: No. Detection of Haemophilus influenzae antigens can reflect bacteria present in the sample, which may or may not be causing active infection, so clinicians interpret results with symptoms and other findings.
: Is this the same as the Hib vaccine test?
: No. This test detects Haemophilus influenzae antigens in a cultured sample and is not a test of vaccine immunity.
: What kind of sample is needed?
: The sample type depends on the infection being evaluated, but this test involves a cultured specimen; your clinician or laboratory will tell you what sample is required.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy