What is the purpose of an ESR test?

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Multiple Choice

What is the purpose of an ESR test?

The ESR test is a non-specific indicator of inflammation that measures how quickly red blood cells settle to the bottom of a tube in one hour. In inflammatory states, certain plasma proteins—especially fibrinogen and some immunoglobulins—increase and promote rouleaux, where red cells stack together. This rouleaux formation reduces the cells’ surface charge and lets them aggregate more easily, so they settle faster. Because many different inflammatory conditions can raise ESR, it serves as a general marker of inflammation rather than a test for a specific infection. It doesn’t directly measure plasma protein concentration, and it isn’t used to determine blood type. Factors like anemia can raise ESR, while polycythemia can lower it. The standard method used is the Westergren technique, and results are given in millimeters per hour.

The ESR test is a non-specific indicator of inflammation that measures how quickly red blood cells settle to the bottom of a tube in one hour. In inflammatory states, certain plasma proteins—especially fibrinogen and some immunoglobulins—increase and promote rouleaux, where red cells stack together. This rouleaux formation reduces the cells’ surface charge and lets them aggregate more easily, so they settle faster. Because many different inflammatory conditions can raise ESR, it serves as a general marker of inflammation rather than a test for a specific infection. It doesn’t directly measure plasma protein concentration, and it isn’t used to determine blood type. Factors like anemia can raise ESR, while polycythemia can lower it. The standard method used is the Westergren technique, and results are given in millimeters per hour.

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