Coccidioides antibody serology (qualitative, serum/plasma)

What This Test Measures

The test detects the presence of antibodies against *Coccidioides* antigens in your blood. These antibodies develop if your body has encountered the fungus, which can live in soil in certain regions (e.g., southwestern U.S., parts of Latin America). Antibodies alone do not confirm an active infection but may suggest exposure or past illness.

Why It’s Ordered

Your healthcare provider may order this test if you live in or have traveled to a high-risk area, have symptoms like fever, cough, or fatigue, or if you have conditions that weaken your immune system. It’s also used to monitor people with known exposure or prior diagnosis.

Symptoms & Exposure

Symptoms of Valley fever (caused by *Coccidioides*) may include flu-like symptoms (fatigue, chills, muscle aches), chest pain, or skin rashes. Exposure often occurs through inhaling spores from contaminated soil during construction, farming, or dust storms. Not everyone shows symptoms, even with exposure.

Test Limitations

This is a screening test. False positives or negatives can occur, especially in people with autoimmune diseases or recent infections. False positives may require follow-up testing for confirmation. Results alone should not diagnose or rule out illness without clinical correlation.