This book provides medical students at the first clinical stage with comprehensive knowledge for the examination subject of clinical chemistry, laboratory diagnostics, hematology, also with regard to exam preparation. A unique feature are the diagrams of cardinal symptoms (19 cardinal symptoms in all, such as pain, temperature, high blood pressure, etc.) which provide a guide from symptom to diagnosis using decision trees. Such overviews are also useful for practicing physicians. The most important methods and techniques are defined in the glossary.