Coccidioides immunoglobulin G (IgG) antibody titer by fluorescence immunoassay (serum/plasma)
This test measures the level of antibodies in your blood that your immune system produces in response to *Coccidioides* (coccidioidomycosis), a fungal infection found in certain desert regions. Antibodies indicate past or current exposure to the fungus.
["Detects past or active exposure to the *Coccidioides* fungus, which can cause infections like Valley Fever."]
Key facts at a glance
- LOINC
- 93834-0
- Short code
- Coccidioides IgM CSF IA-aCnc
- Synonyms
- Coccidioides IgM CSF IA-aCnc
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- CPT
- 82784
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
What This Test Measures
The test looks for IgG antibodies, which are part of your immune system’s long-term response to the fungus. These antibodies develop after your body has been exposed to *Coccidioides* and remain in your blood for months or years. IgG antibodies are often used to diagnose past infection or monitor treatment progress.
Why It’s Done
Your healthcare provider may order this test if you live in or have traveled to areas with high risk of *Coccidioides* exposure (e.g., parts of the southwestern U.S., Central/South America). It may also be used to check for infection if you have symptoms like fever, cough, or fatigue, or if you’ve had recent exposure.
When Results Might Be Abnormal
High IgG antibody levels suggest past or ongoing infection. However, false positives can occur, especially in people with other immune conditions or recent exposures. Your provider will interpret results in the context of your symptoms, medical history, and other tests.
What to Expect Before the Test
No special preparation is needed. A blood sample is drawn from a vein in your arm, similar to other blood tests. You may feel a slight pinch, but it usually takes only a few minutes.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test helps diagnose or confirm *Coccidioides* infection by identifying antibodies produced by your immune system. IgG antibodies are particularly useful for detecting past exposure, while IgA or IgM antibodies (if tested) may indicate recent infection. Results guide treatment decisions, such as antifungal medications or monitoring for complications.
Short name
IgG Antibody to Coccidioides (IgG Ab Coccidioides)
Frequently asked questions
How long does it take to get results from this test?
Can I have a second opinion on my test results?
Do I need to avoid certain foods or supplements before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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