Book excerpt: Lab Literacy for Canadian Doctors helps you to make better decisions about the right tests for typical clinical situations, quickly and efficiently, to improve patient care. Refer to this essential guide for: Advice and information on lab errors, false positives and negatives, and blood and tissue collection. A quick index summarizing the clinical utility of common tests. Sections on dermatology, ENT and respiratory system, endocrine system, fatigue, GI and hepatic system, gynecology and pregnancy, routine screening, and more. Protocols for screening tests that follow Canadian guidelines. Values in both conventional and SI units.