What is the role of radioimmunoassay and enzyme immunoassay in the diagnosis of neonatal abstinence syndrome (NAS)?

Updated: Dec 20, 2017
  • Author: Ashraf H Hamdan, MD, MBBCh, MSc, MRCP, FAAP; Chief Editor: Santina A Zanelli, MD  more...
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These are the most commonly used drug screens. Both are semiquantitative and highly sensitive, but enzyme immunoassay takes less time to perform and is less expensive.

These tests inform the clinician about the presence or absence of substance abuse, rather than quantifying the drug level, as in toxicology screens. Perinatal drug testing aims to examine in utero drug exposure over the pregnancy. Each type of specimen has its own advantages and limitations.

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