Skip to content

Hemophilus influenzae Type-Specific Antibody (Serum) – Immunoassay (Qualitative/Quantitative)

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

This test detects antibodies your immune system produces in response to *Hemophilus influenzae* type b (Hib), a bacteria that can cause serious infections like meningitis or pneumonia, especially in children.

Quick summary

["Helps assess immunity against Hib infection after vaccination or natural exposure."]

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

Key facts at a glance

LOINC
58739-4
Short code
Haem influ Sertyp Islt Aggl
Synonyms
Haem influ Sertyp Islt Aggl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
aggl
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 Is Done

Your doctor may order this test if you have a history of Hib infections, are at high risk (e.g., young children, immunocompromised individuals), or if you’re planning a trip to regions with higher Hib transmission. It may also be used to monitor response to Hib vaccination in children.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample drawn from your arm. The test checks for antibodies in your serum, which may indicate past exposure or vaccination success.

What the Results Mean

A positive result means your body has developed antibodies against Hib, suggesting immunity. A negative result may mean you lack immunity and could benefit from vaccination or booster doses.

Common Causes of Abnormal Results

Low antibody levels could indicate incomplete vaccination, recent Hib infection, or immune system challenges. High levels may reflect prior exposure or vaccination. Always discuss results with your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Role in Diagnosis and Prevention

Short name

H. influenzae IgG Antibody Test

Frequently asked questions

This test is primarily used to confirm immunity status rather than diagnose active Hib infection. It supports vaccination programs by identifying individuals who may need booster doses or preventive measures.
A positive result confirms immunity and helps prevent future infections, especially in vulnerable populations. A negative result prompts vaccination or further evaluation of risk factors.
How long does it take to get results from this test?
Results are typically available within 1–3 business days, depending on lab processing times. Follow-up with your healthcare provider to interpret the results in the context of your health.
Can I get this test if I’m pregnant?
Yes, this test is safe during pregnancy and used to assess Hib immunity in expectant mothers or infants. Always confirm with your doctor if you’re pregnant or have specific concerns.
  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