_____ is a technique for analyzing blood and other body fluids for very small quantities of biologically active substances.

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Radioimmunoassay is a method used in biochemistry for measuring the concentration of a substance in a solution. It involves the use of a radioactive tracer and an antibody to detect and quantify the target substance. Radioimmunoassay is a highly sensitive and specific technique and is commonly used to analyze blood and other body fluids for biologically active substances, such as hormones, drugs, and proteins.

_____ Is a Technique for Analyzing Blood and Other Body