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Bartonellaabserql

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

This blood test detects antibodies against Bartonella bacteria, which can cause cat-scratch disease and other infections.

Quick summary

{"Detects immune response to Bartonella bacteria infection","Helps diagnose cat-scratch disease and related illnesses","Performed on a blood serum sample","Results indicate whether antibodies are present or absent","May require follow-up testing if initial results are unclear"}

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

Key facts at a glance

LOINC
43866-3
Short code
BARTAB
Synonyms
Bartonella Ab Ser Ql
Category
chemistry
Sample
serum
Container
Serum separator tube (SST, gold-top) or red-top tube without anticoagulant
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
immunofluorescence assay (IFA) or enzyme immunoassay (EIA)
CPT
86611
SNOMED
1087081000119107
Specimen volume
1-2 mL of serum
Stability
Stable at room temperature for 8 hours; refrigerated (2-8°C) for 7 days; frozen (-20°C or below) for longer storage up to 30 days. Avoid repeated freeze-thaw cycles.
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
48–168 hours
Order
routine

What is this test?

The Bartonella antibody test is a blood test that looks for antibodies in your blood serum. Antibodies are proteins your immune system makes to fight infections. This test checks whether your body has produced antibodies against Bartonella bacteria, also known as Bartonella henselae or other Bartonella species.

Why is this test done?

This test is primarily used to diagnose Bartonella infections, most commonly cat-scratch disease (CSD). Cat-scratch disease typically occurs after being scratched or bitten by a cat, especially kittens. The bacteria can also be transmitted through scratches from dogs or other animals. Healthcare providers may order this test if you have symptoms such as fever, swollen lymph nodes, fatigue, or a scratch or bite wound that isn't healing properly.

How is the test performed?

A healthcare professional will draw a small blood sample from a vein in your arm. The blood is collected in a tube and sent to a laboratory for analysis. The laboratory will test your serum (the liquid part of your blood) to detect whether Bartonella antibodies are present. You do not need to fast or make any special preparations before this test.

Understanding your results

Results are typically reported as 'Positive' (antibodies detected) or 'Negative' (no antibodies detected). A positive result suggests you have been exposed to Bartonella bacteria. However, it may take 1-2 weeks after infection for antibodies to become detectable. A negative result does not completely rule out infection, especially if you were recently exposed. Your healthcare provider will interpret your results in context with your symptoms and medical history.

Reference range

Negative: No Bartonella species antibodies detected. Positive: IgG titer >= 1:64 or IgM titer >= 1:20 suggests past or current infection; rising titers on paired sera indicate active infection.N/A

Specimen: serum

No special preparation required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How long does it take to get results?
Results are usually available within 2-5 days, depending on the laboratory. Your healthcare provider will contact you with the results or discuss them at a follow-up appointment.
Do I need to fast before this test?
No fasting is required for this test. You can eat and drink normally before having your blood drawn.
What happens if my test is positive?
If your test is positive, it means your immune system has produced antibodies against Bartonella bacteria. Your healthcare provider will discuss treatment options with you, which typically include antibiotics such as azithromycin. Most people recover fully with appropriate treatment.
Can I have a negative result even if I have cat-scratch disease?
Yes, it is possible. It takes time for your body to produce detectable antibodies. If you were recently scratched or bitten and symptoms are present, your healthcare provider may recommend repeat testing in a few weeks or may diagnose based on clinical symptoms alone.
Do I need to see a specialist for this test?
Your primary care physician can order and interpret this test. However, depending on your symptoms or medical condition, you may be referred to an infectious disease specialist for further evaluation and management.
  1. 1
    CDC - Bartonella henselae (Cat Scratch Disease)Source
  2. 2
    Mayo Clinic - Cat-scratch diseaseSource
  3. 3
    Lab Tests Online - Bartonella TestsSource

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