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Serum Anti-Hemophilus influenzae Type B Immunoglobulin G (IgG) Antibody Level

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

This test measures the amount of antibodies your body produces in response to the *Haemophilus influenzae* type B (Hib) bacteria, which can cause serious infections in children and some adults.

Quick summary

["Checks if your immune system has developed protection against Hib infection."]

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

Key facts at a glance

LOINC
41422-7
Short code
S haematobium Ab Ser Ql IB
Synonyms
S haematobium Ab Ser Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
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

Doctors may order this test to evaluate whether a child has developed immunity after receiving Hib vaccination or to monitor immunity in high-risk individuals (e.g., those with weakened immune systems). Adults may also be tested if they have a history of Hib exposure or certain medical conditions increasing infection risk.

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 doesn’t cause discomfort afterward.

How the Results Are Interpreted

Results are compared to a reference range for healthy individuals. Low levels may indicate insufficient immunity, while high levels suggest strong protection. Exact thresholds depend on vaccination history and clinical context.

Possible Causes of Abnormal Results

Low antibody levels could mean the vaccine didn’t fully protect you or your immune system isn’t responding well. Repeated infections, immune disorders, or improper vaccination schedules may also play a role.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Hib IgG Antibody

Frequently asked questions

Will this test affect my vaccination schedule?
No, this test is purely diagnostic. It helps determine if you’re protected but doesn’t alter your vaccination plan. Follow your doctor’s advice for any recommended boosters or retests.
How soon will I get my results?
Results are typically available within 1–3 business days, depending on lab processing time. Your healthcare provider will explain them in detail during your follow-up visit.
Can I get this test at home?
No, this test requires a blood sample collected by a healthcare professional. Some clinics may offer at-home blood draws, but they’re not standard for antibody testing.
  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