What is the buffy coat?

The buffy coat is a thin, white layer of cells that forms between the plasma and red blood cells in a blood sample after it has been spun in a centrifuge. It contains a mixture of white blood cells, platelets, and a small number of red blood cells. The buffy coat is important for various medical tests, as it contains immune cells that can provide important information about a person's health, such as the presence of infections or inflammation. Analysis of the buffy coat can also be used to diagnose certain diseases, such as leukemia or other blood disorders.