radioimmunoassay

/ˌreɪdioʊˌɪmjənoʊˈæseɪ/
noun
  1. A laboratory technique that uses radioactive substances to measure very small amounts of a substance (such as a hormone or drug) in a sample.
    • Scientists developed a radioimmunoassay to test for vitamin D deficiency.
    • Radioimmunoassay is a sensitive method for detecting trace amounts of hormones.
    • The lab used radioimmunoassay to measure the patient's insulin levels.
Synonyms
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