Arneth

Arneth is a term used in hematology to describe a system of counting the number of lobes in a neutrophil. The Arneth count or Arneth index is named after the German physician Josef Arneth.

History

Josef Arneth developed the Arneth count in the early 20th century. He was a German physician who specialized in the study of blood cells. His work in hematology led to the development of the Arneth count, which is still used today in some medical practices.

Method

The Arneth count is performed by examining a blood smear under a microscope. The number of lobes in each neutrophil is counted and the percentage of neutrophils with each number of lobes is calculated. The results are often plotted on a graph, known as an Arneth curve or Arneth histogram.

Significance

The Arneth count is used to help diagnose certain medical conditions. A shift to the left in the Arneth count (an increase in the percentage of neutrophils with fewer lobes) can indicate an infection or inflammation. A shift to the right (an increase in the percentage of neutrophils with more lobes) can indicate a vitamin B12 or folate deficiency.

Limitations

While the Arneth count can provide useful information, it is not a definitive diagnostic tool. Other tests and factors must be considered when diagnosing a patient. Additionally, the Arneth count requires a skilled technician to accurately count and classify the neutrophils.

See also

• Neutrophil
• Hematology
• Blood smear

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