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Hemophilus influenzae serotype-specific antibody detection (serum/plasma)

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

This test measures the presence of antibodies against *Hemophilus influenzae* (a bacterium that can cause infections like meningitis or pneumonia). It helps assess your immune response after exposure or vaccination.

Quick summary

["This test helps doctors check if your body has developed immunity to *Hemophilus influenzae* infection."]

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

Key facts at a glance

LOINC
6600-1
Short code
Haemphilus Spec Cult
Synonyms
Haemphilus Spec Cult
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Matters

Hemophilus influenzae is a common cause of serious infections, especially in children and immunocompromised individuals. This test is often used to evaluate immunity following vaccination or to diagnose past exposure.

What to Expect Before the Test

No special preparation is needed. A blood sample will be drawn from a vein in your arm. You may feel a slight pinch, but it usually takes only a few minutes. If you’re on blood-thinning medication, let your provider know before the test.

What the Test Results Mean

Results are qualitative (positive/negative) and indicate whether your immune system has detected antibodies against *Hemophilus influenzae*. A positive result suggests immunity, while a negative result may mean you need further evaluation or vaccination.

Common Reasons for Testing

Doctors may order this test for children before receiving the *Hemophilus influenzae* vaccine to confirm immunity, or in adults with suspected recent exposure or infection. It’s also used in research or clinical trials related to bacterial immunity.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

H. influenzae Antibody Screening

Frequently asked questions

What does a positive result mean?
A positive result means your blood contains antibodies against *Hemophilus influenzae*, indicating your immune system has likely been exposed to the bacteria (either through infection or vaccination). This suggests you are protected against serious illness from this bacterium.
What if I have a negative result?
A negative result means your body may not have developed antibodies against *Hemophilus influenzae* yet. This could mean you haven’t been exposed, vaccinated, or your immune system hasn’t fully responded. Your doctor may recommend vaccination or further testing if needed.
How often should I get this test?
This test is typically done only once, usually before vaccination or as part of specific clinical evaluations. Follow-up testing is rarely needed unless your doctor advises it for ongoing monitoring or research purposes.
  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