radioimmunoassay
/ˌreɪdioʊˌɪmjənoʊˈæseɪ/
noun
- 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.