MEDOP 230- Dermatology: Laboratory and Diagnostic Procedures
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| Allergy skin testing | Intradermal injection or scratch of liquid allergen; formation of a wheal in response to the allergen is indicative of allergy
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| .Culture and sensitivity (C&S) | Growth of bacteria taken from a wound or lesion in a lab; colonies are used to make a diagnosis and to determine the correct antibiotic treatment.
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| RAST | Blood mixed with an allergen to measure the amount of IgE produced in response; used to identify an allergy and its severity
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| Skin scraping | Scraping of cells from a lesion done with the edge of a scalpel; cells are examined under a microscope to diagnose tinea.
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| Tzanck test | Scraping of fluid from a vesicle to produce a slide for microscopic inspection; used to diagnose herpes virus and shingles.
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| Wood lamp or light | Ultraviolet light used to highlight areas of abnormal skin; light makes vitiligo appear bright white and tinea capitis appear blue-green.
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