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Acetylcarnamnscnc

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

This test measures the level of acetylcarnitine, an important energy-related molecule, in the amniotic fluid surrounding the unborn baby.

Quick summary

{"Acetylcarnitine (C2) is measured in amniotic fluid to assess fetal metabolic health","The test helps screen for certain metabolic disorders that may affect the unborn baby","Sample is collected during amniocentesis procedure","Abnormal levels may indicate metabolic conditions requiring intervention","Results help doctors plan appropriate care during pregnancy and after birth"}

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

Key facts at a glance

LOINC
50156-9
Short code
Acetylcarn Amn-sCnc
Synonyms
Acetylcarn Amn-sCnc
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?

The Acetylcarnitine (C2) test measures the amount of acetylcarnitine, a specialized molecule that helps transport fatty acids into cells for energy production, in the amniotic fluid. Amniotic fluid surrounds and protects the developing baby (fetus) in the womb. By measuring acetylcarnitine levels in this fluid, doctors can learn about the baby's metabolic status and detect potential metabolic disorders early in pregnancy.

How is the sample collected?

The sample is collected through a procedure called amniocentesis. During this procedure, a thin needle is inserted through the mother's abdomen into the uterus to withdraw a small amount of amniotic fluid. The procedure is typically performed under ultrasound guidance to ensure safety. Although amniocentesis carries a small risk of complications (such as infection or miscarriage), it is generally considered safe when performed by experienced healthcare providers.

Why is this test performed?

This test is primarily performed to screen for metabolic disorders in the fetus. Acetylcarnitine is a marker that can indicate how well the baby's body is processing fats and producing energy. Abnormal levels may suggest certain genetic metabolic conditions that affect how the body converts food into energy. Early detection allows healthcare providers to prepare for special care needs after birth and may influence treatment decisions during pregnancy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Is this test dangerous for my baby?
The test itself carries a small risk of complications (approximately 1 in 300 to 1 in 500 cases may result in miscarriage). However, when performed by experienced specialists, amniocentesis is generally safe. The benefits of obtaining crucial information about your baby's health often outweigh these small risks, especially when metabolic disorders are suspected.
How long does it take to get results?
Results typically take several days to a few weeks, depending on the laboratory. The analysis requires specialized testing to accurately measure acetylcarnitine levels. Your healthcare provider will contact you with results as soon as they are available.
What do abnormal results mean?
Abnormal acetylcarnitine levels may suggest that your baby has a metabolic disorder. However, further testing is usually needed to confirm a diagnosis. If results are abnormal, your doctor may recommend additional tests, genetic counseling, or consultation with a metabolic specialist to determine the exact nature of the condition and plan appropriate management.
Can this test predict all metabolic disorders?
No, this test specifically measures acetylcarnitine (C2) and is used to screen for certain types of metabolic disorders, particularly those related to fatty acid oxidation. It is not a comprehensive test for all metabolic conditions. Other tests may be needed to evaluate different aspects of fetal metabolism.
Will I need to make decisions based on the results?
Depending on the results, your healthcare team may discuss various options including specialized prenatal care, planning for delivery at a facility with metabolic specialists, preparing for immediate newborn treatment, or genetic counseling for your family. The goal is to ensure the best possible care for both you and your baby.
  1. 1
    Mayo Clinic - AmniocentesisSource
  2. 2
    MedlinePlus - Metabolic DisordersSource
  3. 3
    March of Dimes - Prenatal TestingSource

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