BSIP EDWIGE / SCIENCE PHOTO LIBRARY BSIP EDWIGE / SCIENCE PHOTO LIBRARY
Allergy testing. View of a young boy holding out his arms whilst a healthcare worker places various allergens on them during a skin prick test for allergies. His arms have been pricked in various places and drops of soluble allergens (in bottles at lower right) are now being applied to these marked sites. Various allergens, such as pollen, dust and fungal spores, may be tested this way. Any skin inflammation indicates an immune response, showing the patient may be allergic to that particular substance. Skin prick tests help to identify allergens that cause conditions like asthma or allergic rhinitis (hay fever). A treatment may thus be prescribed.
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