MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Blood sample for analysis. Sample of blood in a test tube ready for analysis. Blood samples may be 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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