Written for daily dermatological practise, this book provides an updated standardized version on patch testing and prick testing procedures. The different techniques, the visual scoring and the pitfalls interpreting positive and/or negative results are covered in detail. Additional tests such as open, semi-open, roat and use tests, photopatch tests and atopy patch tests are described as well. The revised international standard series of patch tests is reviewed, including succinct explanations for each allergen. Combined with the 2nd book of this mini-series "Management of Positive Patch Test Reactions" it gives a comprehensive account on the subject.