The diagnoses of geotrichosis cannot be determined without using culture or microscopic measurements.[5] The laboratory diagnosis of geotrichosis involves collected fungi samples areas of infections without contamination.[6] Scraping of the mouth lesions and the ulcers can provide a sample of G. candidum. Samples can also be collected from pus and mucus can be obtained from the feces.[5] Sputum can be searched for the mucoid-like white flakes for further examination.[6][5] Culturing the cylindrical barrel-shaped or elliptical fungi in considerable numbers in oral lesions is an indicator that a patient may have geotrichosis.[6] Under the microscope the fungi appears yeast-like and septate branching hyphae that can be broken down into chains or individual arthrospores. Arthrospores appear rectangular with flat or rounded ends.[3][5] Under the microscope the arthroconidia size range from 6-12μm x 3-6μm.