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The white blood cell differential is a common blood test that is often ordered alongside a complete blood count.The test may be performed as part of a routine medical examination; to investigate certain symptoms, particularly those suggestive of infection or hematological disorders; [5] [6] or to monitor existing conditions, such as blood disorders and inflammatory diseases.
Human leukocyte antigens (HLA) began as a list of antigens identified as a result of transplant rejection. The antigens were initially identified by categorizing and performing massive statistical analyses on interactions between blood types. [1]
The name "white blood cell" derives from the physical appearance of a blood sample after centrifugation.White cells are found in the buffy coat, a thin, typically white layer of nucleated cells between the sedimented red blood cells and the blood plasma.
In 1833, Marie-Antoine Carême described four grandes sauces (great sauces). [3] In 1844, the French magazine Revue de Paris reported: . Don’t you know that the grand sauce Espagnole is a mother sauce, of which all the other preparations, such as reductions, stocks, jus, veloutés, essences, and coulis, are, strictly speaking, only derivatives?