radioimmunoassay

Radioimmunoassay (RIA) is a laboratory technique used to measure tiny amounts of biological substances, like hormones or drugs, in the blood. It works by combining a specific antibody with a known amount of radioactive-labeled substance and then adding the blood sample. The substance in the sample competes with the radioactive version to bind with the antibody. By measuring the radioactivity remaining in the mixture, scientists can determine the concentration of the substance in the sample accurately. RIA is highly sensitive and precise, making it valuable for diagnosing conditions and monitoring treatments.