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You are here : AllRefer.com > Health > Tests & Exams > Wood's lamp examination

Wood's lamp examination

Alternate Names : Black light test, Ultraviolet light test

Definition

A Wood's lamp examination is a test that uses ultraviolet light to closely look at the skin.

Why is the Test Performed?

Your health care provider may perform this test to detect several conditions affecting the skin, including

  • Bacterial infections
  • Fungal infections
  • Porphyria
  • Skin coloring changes
How is the Test Performed?

The test is done while you are seated in a dark room, usually in a dermatologist's office. The health care provider turns on the Wood's lamp, holds it 4 to 5 inches from the area of skin being studied, and looks for any skin color changes.

You should not 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 will the Test Feel?

You will feel nothing during this test.

Pictures & Images

Wood's lamp test - of the scalp
Wood's lamp test - of the scalp

Wood's lamp illumination
Wood's lamp illumination

     
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Review Date : 10/28/2008
Reviewed By : Michael Lehrer, M.D., Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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