WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY
Image of a blood sample in a test tube. Blood tests may be divided into three categories: haematological, biochemical and microbiological. The first one analyses the components of the blood itself, the second one measures the chemicals in the blood and the microbiological test looks for microorganisms such as bacteria, viruses and fungi.
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