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Baibamnmcnc

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

This test measures the level of beta aminoisobutyrate, a special protein building block, in the amniotic fluid that surrounds your baby during pregnancy.

Quick summary

{"A prenatal test that checks amniotic fluid for beta aminoisobutyrate levels","Helps doctors assess fetal development and health status","Abnormal levels may indicate certain fetal conditions or pregnancy complications","Collected through amniocentesis procedure","Results help guide pregnancy management decisions"}

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

Key facts at a glance

LOINC
13385-0
Short code
B-AIB Amn-mCnc
Synonyms
B-AIB Amn-mCnc
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

What is this test?

Beta aminoisobutyrate (β-AIB) is a non-protein amino acid found in amniotic fluid. This test measures how much of this substance is present in the amniotic fluid, which is the protective liquid that surrounds your developing baby in the womb. The test is performed using a sample of amniotic fluid collected during pregnancy.

How is the sample collected?

Amniotic fluid is collected through a procedure called amniocentesis. A thin needle is inserted through your abdomen into the uterus to withdraw a small amount of amniotic fluid. This procedure is typically performed under ultrasound guidance to ensure safety for both you and your baby. The sample is then sent to a laboratory for analysis.

Why might I need this test?

Your healthcare provider may recommend this test as part of prenatal assessment to evaluate fetal well-being. It may be used to help detect certain genetic conditions, assess fetal growth, or investigate pregnancy complications. The test provides additional information about your baby's development and health status.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Is this test safe for my baby?
Amniocentesis carries a small risk of complications including infection, bleeding, or preterm labor. Your healthcare provider will discuss these risks with you and perform the procedure using ultrasound guidance to minimize complications.
How long does it take to get results?
Results typically take several days to a week, depending on the laboratory. Your healthcare provider will contact you with the results and explain what they mean for your pregnancy.
What do abnormal results mean?
Abnormal beta aminoisobutyrate levels may indicate various conditions. Your healthcare provider will interpret the results in context with other prenatal findings and discuss any necessary follow-up testing or interventions.
Does this test diagnose specific conditions?
This test provides supportive information rather than a definitive diagnosis. It is often used alongside other prenatal tests and assessments to evaluate fetal health comprehensively.
  1. 1
    LOINC - Beta aminoisobutyrate in Amniotic fluidSource
  2. 2
    March of Dimes - AmniocentesisSource

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