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Serum Antibody to *Coccidioides* (IgG) by Immunoassay

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

This test measures antibodies in your blood that your immune system produces in response to *Coccidioides* (a fungal infection also called Valley Fever). Antibodies help your body fight off infections.

Quick summary

["Detects past or current exposure to *Coccidioides* fungus, a common cause of respiratory illness in certain regions."]

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

Key facts at a glance

LOINC
93227-7
Short code
Coccidioides Ag Ur IA-mCnc
Synonyms
Coccidioides Ag Ur IA-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Does This Test Measure?

The test looks for *IgG* antibodies, which are part of your immune system’s defense. These antibodies develop after your body has been exposed to *Coccidioides* spores. The presence of these antibodies suggests you may have had an infection, even if you don’t currently have symptoms.

Why Might You Need This Test?

Your doctor may order this test if you live in or have traveled to areas where *Coccidioides* is common (e.g., parts of the southwestern U.S., Mexico, or South America). It can also be used to monitor treatment or check for recurrence in people who have had Valley Fever.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test is quick and typically done in a lab setting.

What to Expect After the Test

You may experience mild bruising or soreness at the injection site. Results are usually ready within a few days to a week, depending on your lab.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Coccidioides IgG Antibody

Frequently asked questions

Can this test tell me if I currently have Valley Fever?
No, this test only detects past exposure through antibodies. If you suspect an active infection, your doctor may recommend additional tests or imaging.
What does a high antibody level mean?
A high level suggests you’ve likely been exposed to *Coccidioides*. It doesn’t always mean you’re currently sick, but it can help your doctor assess your risk or monitor treatment if you’ve had Valley Fever before.
Is this test safe?
Yes, blood tests are generally safe. The only minor risk is a small bruise or slight discomfort at the injection site. Always follow your doctor’s instructions for any post-test care.
  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