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Coccidioides antibody test
A blood sample is needed. For information on how this is done, see: Venipuncture
The blood sample is sent to a lab. The health care provider looks at the clear liquid part of the blood, called serum, to see if there are antibodies to Coccidioides immitis.
There is no special preparation for the test.
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
This test is used to detect infection with the fungus that causes coccidioidomycosis. This condition can cause lung or widespread (disseminated) infection.
A normal result means no Coccidioides immitis antibodies are detected in the blood sample.
Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.
Abnormal results mean that Coccidioides immitis antibodies are present. This can mean that you have a current or recent infection.
The test may be repeated after several weeks to detect a rise in titer (antibody concentration), which confirms an active infection.
In general, the worse the infection, the higher the titer, except in people with a weakened immune system.
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
Galgiani JN. Coccidioides species. In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, PA: Elsevier Churchill Livingstone; 2009:chap 266.
Galgiani JN. Coccidioidomycosis. In: Goldman L, Ausiello D, eds. Goldman's Cecil Medicine. Philadelphia, PA: Saunders Elsevier; 2007:chap 354.