Every day, millions of urine and stool samples are collected and analyzed around the world. Yet an often-overlooked problem remains: can we trust the sample before we trust the result?This book explores the hidden weaknesses of current collection methods and the consequences they may have on diagnosis, treatment, and healthcare costs.In this book, we examine a long-neglected challenge and invites readers to rethink one of the most routine procedures in modern medicine.Sometimes the biggest problems are hiding in the simplest steps.