: Coccidioides immitis/posadasii Antibody Panel, Serum

: What This Test Measures

: The test looks for antibodies your immune system produces in response to Coccidioides fungi (Coccidioides immitis and Coccidioides posadasii). Antibodies are proteins made by the immune system when it encounters an infection. Detecting them in serum can suggest recent or past exposure to the fungus.

: Why It Is Ordered

: A healthcare provider may order this panel when a person has symptoms of Valley fever, such as fever, cough, chest pain, fatigue, or a rash, especially after living in or traveling to areas where the fungus is common, such as the southwestern United States. It can also help evaluate unexplained respiratory illness.

: How the Sample Is Collected

: The test uses a serum sample, which is the clear liquid part of blood obtained after a blood draw. A healthcare professional collects blood from a vein in your arm, and the sample is sent to a laboratory for analysis.

: What the Results Mean

: Results are typically reported as positive or negative, sometimes with antibody levels or types. A positive result may indicate exposure to or infection with Coccidioides, while a negative result does not always rule out infection. Your provider interprets results alongside your symptoms, history, and other tests. This test does not provide a specific numeric reference range.