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Coccidioides IgG Antibody (Serum/Plasma) – Quantitative Immunoassay

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

This test measures the level of antibodies in your blood that your immune system produces in response to *Coccidioides* fungi, a type of mold found in certain soil regions. It helps diagnose infections caused by this fungus, often linked to valley fever.

Quick summary

["This test helps detect if you’ve been exposed to *Coccidioides* and may indicate an infection requiring further evaluation."]

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

Key facts at a glance

LOINC
51477-8
Short code
Coccidioides IgM Spec Ql ID
Synonyms
Coccidioides IgM Spec Ql 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
CPT
82784
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 Is This Test Done?

Your healthcare provider may order this test if you live in or have traveled to areas with high risk for *Coccidioides* exposure (e.g., parts of the southwestern U.S., Central/South America). Symptoms like fever, cough, or fatigue may prompt testing, especially if you’ve had recent exposure to dusty soil.

What Does a Positive Result Mean?

A positive result suggests your body has developed antibodies to *Coccidioides*, which could mean past exposure or infection. However, antibodies may persist long after the infection clears, so results alone don’t always confirm active disease. Follow-up testing or clinical symptoms may guide further action.

What to Expect During the Test

A blood sample is drawn from a vein in your arm. The sample is sent to a lab where antibodies are measured using an immunoassay method. Results are typically ready within a few days.

Possible Side Effects or Risks

Most people experience only mild discomfort or bruising at the injection site. Rarely, blood draws can cause fainting or infection, but these are uncommon.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Coccidioides IgG Antibody (Screen/Confirm)

Frequently asked questions

How long does it take to get results?
Results are usually available within 2–5 business days, depending on lab processing times. Your healthcare provider will discuss the results with you during your follow-up visit.
Can I take anything before the test?
No special preparations are needed. However, inform your provider about any medications or supplements you’re taking, as some may affect test results.
What if my test results are positive but I don’t have symptoms?
A positive antibody test alone doesn’t always mean you’re currently infected. Some people develop antibodies years after exposure without symptoms. Your provider will assess your medical history, symptoms, and other test results to determine next steps, such as retesting or further evaluation.
  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