Farr test

Farr test
(a radioimmunoassay for measuring absolute amounts of antibody) antibody is reacted with radiolabeled antigen and precipitated with ammonium sulfate; bound antigen or hapten is precipitated while free antigen remains in solution. This test is based on the capacity of antibody to combine with antigen rather than on such secondary properties as precipitation and therefore measures all immunoglobulin classes and subclasses.

Medical dictionary. 2011.

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