How do you test for toenail fungus?

Usually, your healthcare provider must confirm your diagnosis using laboratory tests before prescribing antifungal treatment. To confirm the diagnosis, the healthcare provider may collect a nail sample to look at under a microscope or send it to a laboratory for analysis. The healthcare provider will examine your nails and may take some nail clippings or scrape off any debris under the nail. These samples are sent to a laboratory to identify the cause of the symptoms.

To find out if a patient has nail fungus, a dermatologist examines the nails and nearby skin. It's important to examine the skin because the fungus can spread. You may already have a skin infection caused by a fungus, such as athlete's foot. This test is used to detect and diagnose nail infections using a PAS stain.

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