4 doctors weighed in:

How far back does a meconium drug test on a newborn go?

4 doctors weighed in
3 doctors agree

In brief: Last trimester:

Meconium is preferred over urine for testing of neonates.
Urine testing indicates drug use only over the last 1–10 days, depending on the drug. Meconium documents drug use over an extended period of time, covering at least the last trimester of pregnancy.

In brief: Last trimester:

Meconium is preferred over urine for testing of neonates.
Urine testing indicates drug use only over the last 1–10 days, depending on the drug. Meconium documents drug use over an extended period of time, covering at least the last trimester of pregnancy.
Dr. Michael H. T. Sia
Dr. Michael H. T. Sia
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