This book is intended to serve as a study aid to improve student performance on national certification examinations in medical laboratory technology (clinical laboratory science) at both the technician and technologist levels. The new organisation of topics also makes the book useful to students as they prepare for examinations in their educational programs and to laboratory personnel who are cross-training. The book is based on over twenty years of experience teaching hundreds of students who have successfully passed certification examinations at both technician and technologist levels. The book is written in rapid-fire question/answer format, without distractors that may be mistakenly assimilated as the correct answer. Readers are challenged to generate their own answer rather than choosing one based on recognition or guessing. The two boxes next to each question are a time-management aid that enable the reader to keep track of correct and incorrect answers and quickly identify topics that require further study. Many of the answers provide additional information beyond what was requested in the question. These questions and answers provide a review of the knowledge-base required to answer typical examination questions.