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Benzodiazmecmcnc

Published: August 9, 2026Updated: August 16, 2026

This test checks if a newborn has been exposed to benzodiazepine medications during pregnancy by analyzing the baby's first stool (meconium).

Quick summary

{"Meconium testing detects benzodiazepine exposure during pregnancy","Results help identify newborns who may need monitoring for withdrawal symptoms","The test is typically ordered when there is concern about maternal medication use","Positive results do not always mean the baby will have health problems","Early detection allows for proper care and monitoring of the newborn"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
11023-9
Short code
Benzodiaz Mec-mCnc
Synonyms
Benzodiaz Mec-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

The benzodiazepine test in meconium is a laboratory test that detects the presence of benzodiazepines or their breakdown products (metabolites) in a newborn's first stool, called meconium. Meconium forms during the second and third trimesters of pregnancy and can accumulate drug exposures over time, making it an ideal sample for detecting prenatal drug exposure.

Why is this test done?

This test is usually ordered when healthcare providers suspect that a mother may have used benzodiazepine medications during pregnancy. Benzodiazepines are commonly prescribed for anxiety, sleep disorders, or seizures, but they can cross the placenta and affect the developing baby. Common benzodiazepines include diazepam (Valium), lorazepam (Ativan), alprazolam (Xanax), and clonazepam (Klonopin).

How is the sample collected?

A small sample of meconium (the newborn's first stool) is collected from the diaper shortly after birth. The sample is then sent to a laboratory for analysis. This is a non-invasive test that does not cause any discomfort to the baby.

What do the results mean?

A positive result indicates that the baby was exposed to benzodiazepines during pregnancy. However, the result does not necessarily mean the baby will experience problems. Some babies may develop symptoms of neonatal abstinence syndrome (withdrawal), which can include irritability, feeding difficulties, tremors, or sleep disturbances. Healthcare providers will monitor the baby closely and provide treatment if needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Is this test painful for my baby?
No, the test is not painful. It simply involves collecting a small amount of meconium from the baby's diaper, which is already happening naturally after birth.
Will my baby need treatment if the test is positive?
Not necessarily. Some babies exposed to benzodiazepines may not develop any symptoms, while others may have mild to moderate withdrawal symptoms that require monitoring and supportive care. Only babies with significant symptoms will need specific treatment.
How long does it take to get results?
Results typically take a few days to a week, depending on the laboratory. Your healthcare provider will discuss the results with you as soon as they are available.
What are benzodiazepines?
Benzodiazepines are a class of prescription medications commonly used to treat anxiety, insomnia, seizures, and muscle spasms. Examples include diazepam, lorazepam, alprazolam, and clonazepam. These medications can cross the placenta during pregnancy.
Is this test mandatory?
This test is not routine for all newborns. It is typically ordered only when there is a specific clinical concern about potential drug exposure, such as a known maternal history of benzodiazepine use or unusual symptoms in the newborn.
  1. 1
    MedlinePlus - Neonatal Abstinence SyndromeSource
  2. 2
    Mayo Clinic - Neonatal abstinence syndromeSource
  3. 3
    American College of Obstetricians and Gynecologists - Benzodiazepine Use During PregnancySource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy