Understanding Your Laboratory Test: What It Is, Why It Is Done, and How to Interpret Your Results
This test measures a specific fatty acid metabolite in amniotic fluid to screen for metabolic disorders in the unborn baby.
{"Measures 3-Hydroxylinoleoylcarnitine levels in amniotic fluid during pregnancy","Screens for fetal metabolic disorders affecting fatty acid metabolism","Helps detect conditions that could affect the baby's health after birth","Sample collected through amniocentesis procedure","Abnormal results require follow-up testing and specialist consultation"}
Key facts at a glance
- LOINC
- 50111-4
- Short code
- 3OH-Linoleoylcarn Amn-sCnc
- Synonyms
- 3OH-Linoleoylcarn 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
This is a laboratory test that measures specific substances in a sample taken from your body, most often a small amount of blood or urine. Your healthcare provider uses the results to check how well your organs are working, screen for certain conditions, or monitor a treatment you are already receiving.
The 3-Hydroxylinoleoylcarnitine (C18:2-OH) test measures the amount of a specific fatty acid metabolite called 3-Hydroxylinoleoylcarnitine in the amniotic fluid that surrounds the baby during pregnancy. This substance is formed when the body processes linoleic acid, an important omega-6 fatty acid. The test is performed on amniotic fluid collected during amniocentesis and is used to detect potential metabolic disorders in the developing fetus.
Your doctor may order this test as part of a routine checkup, to help find the cause of symptoms you are experiencing, to confirm or rule out a suspected condition, or to track how a disease is progressing and how well your current treatment is working over time.
This test is performed as part of prenatal metabolic screening to identify disorders in the fetus that affect how the body breaks down fats for energy. Detecting these conditions during pregnancy allows healthcare providers to prepare for special care needs immediately after birth, which can prevent serious complications and improve outcomes for the baby.
Results are compared with reference ranges, which are the values typically seen in healthy people. A result that is higher or lower than normal may point to an infection, inflammation, an organ problem, or another condition, but it does not always mean you are ill. Your provider will explain your numbers and decide whether additional testing or treatment is needed.
Normal levels of 3-Hydroxylinoleoylcarnitine in amniotic fluid suggest the baby does not have the specific metabolic disorders this test screens for. Elevated levels may indicate a fatty acid oxidation disorder, which affects how the body converts fat into energy. If results are abnormal, genetic counseling and additional testing are typically recommended to confirm a diagnosis.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test helps detect fatty acid oxidation disorders in the fetus, including conditions like medium-chain acyl-CoA dehydrogenase deficiency (MCAD), very long-chain acyl-CoA dehydrogenase deficiency (VLCAD), and other metabolic conditions. Early detection allows for prompt treatment after birth, including dietary management and avoidance of fasting, which can prevent life-threatening complications. The test is particularly valuable for families with a history of metabolic disorders or when other screening tests show abnormal results.
Frequently asked questions
Is this test part of routine prenatal care?
How is the sample collected?
What happens if the results are abnormal?
Can this test tell me exactly what metabolic disorder my baby has?
Sources
- 1
- 2
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 16, 2026. · Read our editorial policy