Coccidioides antibody titer (serum/plasma)
This test measures the level of antibodies your body produces in response to *Coccidioides* (a fungal infection). It helps determine if you’ve been exposed to the fungus, which can cause illness in some people.
["This test checks for past or current exposure to a fungal infection that may affect your lungs or other organs."]
Key facts at a glance
- LOINC
- 51788-8
- Short code
- Coccidioides Ab Titr Ser ID
- Synonyms
- Coccidioides Ab Titr Ser ID
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- immune-diffusion
- 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 if you have symptoms like fever, cough, chest pain, or fatigue—especially if you live in or traveled to an area where *Coccidioides* is common, such as parts of the southwestern U.S., Mexico, or Central/South America. It may also be used to monitor treatment for a confirmed infection or to check for recurrence.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample (usually from your arm) in a clinic or lab. The test is quick and typically done while you’re sitting or lying down. If you’re on blood thinners, let your provider know before the draw.
What the Test Results Mean
Results are reported as a titer value (a numerical measure of antibody strength). A positive result suggests exposure to the fungus, but it doesn’t always mean you’re currently sick. Higher titers may indicate a stronger immune response or an active infection. Always discuss results with your healthcare provider.
Possible Side Effects or Risks
The most common side effect is a mild bruise or soreness at the needle site. Rarely, blood clots or allergic reactions can occur, but these are uncommon with standard blood draws. If you experience severe pain, swelling, or signs of infection (like redness or fever) after the test, contact your provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Coccidioides antibody test
Frequently asked questions
This test helps diagnose *Coccidioidomycosis*, a fungal infection that can cause mild flu-like symptoms or severe lung disease in some people. It’s also used to guide treatment decisions, such as whether to start antifungal medications or monitor symptoms closely. Antibody levels can change over time, so follow-up tests may be needed if symptoms persist or worsen.
How long does it take to get results? Results are usually available within 1–3 business days, depending on your lab. Your provider will contact you once they’re ready.
Is there anything I should avoid before the test? Avoid heavy meals or excessive alcohol 2 hours before the blood draw, but no other restrictions apply. If you’re on blood thinners, inform your provider beforehand.
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