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Ency. home > Test > W > Wood's lamp

Wood's lamp    See images

Overview | Risks | Results

Alternative names:

Black light test; Ultraviolet light test

Definition:

Wood's lamp is a test that is performed in a dark room where ultraviolet light is shined on the area of interest.

How the Test is Performed

You will be seated and the lights will be turned off. After your eyes adjust to the darkness, your physician will turn on the Wood's lamp and hold it 4 to 5 inches from the area being studied. Your physician will then look at your skin for any color changes. (Take care not to look directly into the light.)

How to Prepare for the Test

No special preparation is needed. If you are treating the area in question with any topical medications, you may wish to skip an application before visiting the doctor.

How the Test will Feel

You will feel nothing during this test. Likewise, there should be no adverse side effects.

Why the Test is Performed

Your health care provider may perform this test to detect several conditions, including:

  • Bacterial infections
  • Fungal infections
  • Porphyria
  • Pigmentary alterations

Ency. home > Test > W > Wood's lamp

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