Blood chemistry testing identifies many chemical blood constituents. It is often necessary to measure several blood chemicals to establish a pattern of abnormalities. A wide range of tests can be grouped under the headings of enzymes, electrolytes, blood sugars, lipids, hormones, proteins, vitamins, minerals, and drug investigation. Other tests have no common denominator. Selected tests serve as screening devices to identify target organ damage. When collecting specimens for chemistry studies, refer to Standard Precautions for Prevention and Control of Infection in Appendix A, Guidelines for Specimen Transport and Storage in Appendix B, and Effects of Drugs on Laboratory Tests in Appendix E.
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