|
Wood's lamp examinationDefinitionA Wood's lamp examination is a test that uses ultraviolet light to closely look at the skin. Alternative NamesBlack light test; Ultraviolet light test How the Test is PerformedThe 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 TestNo 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 FeelYou will feel nothing during this test. Why the Test is PerformedYour health care provider may perform this test to detect several conditions affecting the skin, including
Normal ResultsNormally your skin will not shine, or fluoresce, under the ultraviolet light. What Abnormal Results MeanA Wood's lamp exam may help your doctor confirm a fungal infection or bacterial infection. Your doctor may also be able to learn what is causing any light- or dark-colored spots on your skin. RisksThere are no risks. Avoid looking directly into the ultraviolet light. ConsiderationsDo not wash before the test, because that may cause a false-negative result. A room that is not dark enough may also alter results. Other materials may also glow. For example, some deodorants, make-ups, soaps, and even lint may be visible with the Wood's lamp. Not all types of bacteria and fungi can be detected with the light.
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. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997-
A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.  |
