Understanding Your Laboratory Blood Test: What It Is and Why It Matters
This test checks if a newborn has been exposed to barbiturate drugs by testing the baby's first stool (meconium).
{"Detects barbiturate drug exposure in newborns","Uses meconium (baby's first stool) as the sample","Helps identify infants who may need special care for drug withdrawal","Can show drug exposure during the entire pregnancy","Results help doctors plan appropriate treatment if needed"}
Key facts at a glance
- LOINC
- 110898-4
- Short code
- Barbiturates Msmt Mec
- Synonyms
- Barbiturates Msmt Mec
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 3.5
- Ref high
- 7.2
- 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, and why might my doctor recommend it for me?
The barbiturates test in meconium is a laboratory test that detects whether a newborn baby has been exposed to barbiturate drugs during pregnancy. Barbiturates are a class of medications that act as central nervous system depressants, sometimes prescribed for anxiety, sleep disorders, or seizure control. This test uses meconium—the baby's first stool passed after birth—as the sample, because drugs and their breakdown products accumulate in meconium over time.
How is this test performed, and what can I expect during the procedure?
A small sample of meconium is collected from the baby's diaper and sent to a laboratory for analysis. The test looks for barbiturate drugs and their metabolites (breakdown products) in the sample. Meconium testing can typically detect drug exposure that occurred during the latter half of pregnancy, providing a longer window of detection compared to other tests like urine or blood.
Why is this test important for managing my overall health and treatment plan?
This test is important because it helps healthcare providers identify babies who may have been exposed to barbiturate drugs before birth. If a baby has been exposed, they may experience neonatal abstinence syndrome (NAS) or withdrawal symptoms after birth, which can include irritability, feeding difficulties, tremors, and sleep problems. Early detection allows doctors to provide appropriate care and monitoring to help the baby through this period.
Reference range
NCBI: Uric Acid Male 3.5-7.2 mg/dL; Female 2.5-6.8 mg/dLN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The barbiturates test in meconium is primarily used to screen for prenatal drug exposure, particularly in situations where there is concern about maternal drug use during pregnancy. It can help identify infants who may need specialized care for drug withdrawal symptoms. The test results can also be important for child protection cases and for guiding appropriate medical management of the newborn. Additionally, this information can help healthcare teams provide support and resources to families dealing with substance use issues.
Frequently asked questions
Is this test painful for my baby?
How long does it take to get results?
What do positive results mean?
Can the test give false results?
Will my information be kept confidential?
Sources
- 1
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- 3
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.
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 17, 2026. · Read our editorial policy