What technique is often coupled with a radioimmunoassay to determine that a drug is present in a person?

Name: What technique is often coupled with a radioimmunoassay to determine that a drug is present in a person?
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Gas chromatography / mass spectrometry (GC/MS) is commonly used in combination with radioimmunoassay for the confirmation and quantification of drugs in biological samples. This technique provides high specificity and sensitivity, making it ideal for detecting low levels of drugs.

What Technique Is Often Coupled with a Radioimmunoassay to Determine