The book is the result of a three-year long international collaboration within IP Erasmus project entitled Classic and Modern Methods for Molecular Diagnostics in Human Pathology (2011-2013).The book is recomended for all interested persons, such as PhD students and Master students from the Erasmus project, PhDs, medical doctors, young researchers and last but not least, students.In the chapters, researches from different European countries describe methods and techniques for proper diagnosis of diseases. Theoretical as well practical informations are presented.