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Thoma haemacytometer, Germany, 1891-1930

A haemacytometer calculates the number of blood cells within a given amount of blood. The first haemacytometer was invented by German physician, Karl Vierordt (1818-84) in 1852. His invention was later adapted by many others. Any increase or decrease in blood cells in the blood is analysed. It may indicate disease within the body. A low level of red blood cells is called anaemia. A high level of red blood cells is called polycythaemia. This haemacytometer is seen with pipettes and counting chamber. It was made by Carl Zeiss in Jena, Germany.

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Glossary: histology

The study of the structure of tissues by means of special staining techniques combined with light and electron microscopy.

Glossary: haemacytometer

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