JOHN GREIM / SCIENCE PHOTO LIBRARY JOHN GREIM / SCIENCE PHOTO LIBRARY
Blood samples for analysis. Gloved hand of a technician holds a rack of test tubes containing blood samples taken for medical analysis. Each test tube is identified by a bar- code. Blood samples are subjected to many tests that can reveal a patient's state of health. The analysis may involve determining blood cell composition or levels of blood chemicals (including drugs and hormones). Blood tests may indicate disorders of the metabolism and immune system, and they can detect infections.
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