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Antibody to *Neisseria meningitidis* Group B (serum/plasma)

Published: August 9, 2026Updated: August 17, 2026

This test measures your immune response to *Neisseria meningitidis* Group B bacteria, which can cause serious infections like meningitis or sepsis. It helps assess protection after vaccination or exposure.

Quick summary

["Checks if your body has developed immunity against Group B meningococcal bacteria."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
7083-9
Short code
BAHR
Synonyms
Black Ant BasoBnd Ab Qn
Category
chemistry
Sample
whole-blood
Container
Sodium heparin (green-top) tube for whole blood basophil histamine release assay; EDTA tube may be acceptable per laboratory protocol
Units
N/A
Ref low
0
Ref high
10
Critical range
— – 10000 N/A
Fasting
false
Population
adult
Sex
all
Age range
5–99 years
Method
Basophil histamine release assay (flow cytometry or fluorometric method)
CPT
83520
SNOMED
395112001
Specimen volume
5-10 mL of whole blood; minimum 3 mL
Stability
Specimen should be processed within 4 hours of collection when kept at room temperature (18-25°C). Do not refrigerate or freeze whole blood sample. If delayed, contact laboratory for specific stability requirements.
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
24–72 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you’ve received the meningococcal B vaccine, had recent exposure to someone with meningococcal disease, or if you’re at higher risk for infection (e.g., due to immune conditions or travel to areas with outbreaks). It can also be used to monitor immune response in research or clinical trials.

What to Expect Before the Test

No special preparation is needed. A blood sample will be taken 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 thinners, let your provider know before the test.

What the Results Mean

Results are qualitative (yes/no) and indicate whether detectable antibodies were found. High levels suggest immunity, while low or absent levels may mean you’re not protected. Follow-up testing or vaccination may be recommended if results are unclear.

Common Reasons for Testing

This test is primarily used to evaluate immune status post-vaccination or after exposure to *N. meningitidis* Group B. It’s not a routine screening test for most people.

Reference range

Negative: <10% histamine release above baseline; Positive: ≥10% histamine release above baseline. Results interpreted in conjunction with clinical history and other allergy testing.N/A

Specimen: whole-blood

No fasting required. Patients should discontinue antihistamines (H1 and H2 blockers), tricyclic antidepressants, and topical corticosteroids for 5-7 days prior to testing as advised by the ordering physician. Beta-agonists should be held as clinically appropriate. Inform provider of all current medications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test helps determine if a person has developed protective antibodies against Group B meningococcal bacteria. Positive results suggest immunity, which is critical for preventing infections in high-risk individuals. Negative or low results may prompt further evaluation, vaccination, or additional monitoring.

Short name

Meningococcal Group B Antibody

Frequently asked questions

Will this test show if I have meningitis?
No. This test measures antibodies, not active infection. If you suspect meningitis or another infection, other tests (like blood cultures or lumbar punctures) would be needed.
Can I get this test at home?
No. Blood tests like this are typically done in a clinical lab or doctor’s office. A healthcare provider will collect the sample.
How long will it take to get my results?
Results are usually available within 1–3 business days, depending on lab processing times. Your provider will discuss them with you.
  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 17, 2026. · Read our editorial policy