A member asked:

How far back into a pregnancy cord blood tests will show meth use? we are foster parents waiting for results on the baby and mom of our foster daughte

A doctor has provided 1 answer

Not where we look: If I want to verify type or length of drug exposure in a newborn I check their first poop. The poop begins to form about 12 weeks into pregnancy and it remains metabolically inactive after it forms. It can provide data looking back several months,retaining trace amounts of the drugs. Some specialty labs do hair testing which can also yield data. Blood tests record more recent exposure.

Answered 1/23/2017

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