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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Why the newborn drug screen test become positive for TCA?

a newborn drug screen is positive for TCA. Mother took PROZAC before she knew she was pregnant and stated she discontinued all meds when the pregnancy was confirmed.. Mother states she takes no medication. Urine test on mother was negative. What is the maximum time in the past that the mother could have ingested TCA in order for baby to test positive?
Tue, 27 Feb 2018
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Pediatrician, Neonatology 's  Response
Thank you for your question.
It seems that mother continued the medicine at least till 20 weeks of pregnancy. And it takes some time for the baby to get rid of the metabolized products of the leftover drugs from the blood stream.
Drug screen should be repeated after 1 week and if still positive then again after 6 weeks. By that time screening test will be negative.
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Why the newborn drug screen test become positive for TCA?

Thank you for your question. It seems that mother continued the medicine at least till 20 weeks of pregnancy. And it takes some time for the baby to get rid of the metabolized products of the leftover drugs from the blood stream. Drug screen should be repeated after 1 week and if still positive then again after 6 weeks. By that time screening test will be negative.