In a quarter million clinical laboratories in the United States alone, techs work every day with little visibility or recognition. During the Covid pandemic, they risked exposure and worked extensive overtime running tests to produce accurate, timely results for patients. At all times, they must learn ever-changing technology while managing family life around a demanding job. This book chronicles the unseen work of laboratory technicians, technologists, and aides through interviews and the author's experience working in a clinical lab for more than 40 years, a time that saw astounding changes in lab technology, methodology, and testing. Most importantly, this book provides the human story of patients, diseases, and conditions diagnosed and monitored through lab work.