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Current nursing practice demands that nurses not only recognize when a laboratory test result reveals abnormalities, but how these results can and should affect the care of their patients. This text presents comprehensive explanations of laboratory testing while providing a framework for understanding this relationship. It presents information that will assist nursing professionals in preparing patients for laboratory tests done on blood, urine, stool, bone marrow and crebrospinal fluid, and describes in detail the methods used for collecting specimens. The clinically oriented approach adopted here allows readers to understand the links among the tests performed. This edition has been considerably revised to include updated studies; the addition of pediatric values to normal ranges discussed; and a new section on diagnostic tests organized by general categories of diagnostic studies, such as angiography, electrodiagnostic studies, endoscopy, nuclear scans, and others.