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Presumptive diagnosis of blastomycosis is done by obtaining the patient's history and by seeing the fungi in samples taken from skin scrapings or other infected tissue and examined microscopically. However, the definitive diagnosis of blastomycosis is done by isolating (growing) the fungus from one or more tissue samples (blood or sputum samples or biopsy samples from skin, bone marrow, liver, or other organs). In addition, there are immunology-based tests that can detect fungi present in urine or blood. Another available test can detect antibodies directed against the fungi; this test indicates whether the person has been exposed to the fungi but does not determine active infection.
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