Elevated Circulating C12 Acylcarnitine Concentration C5936890
Elevated C12 acylcarnitine indicates a buildup of medium-chain fatty acids in the blood, often detected through newborn screening. It may suggest a fatty acid oxidation disorder affecting energy production. Management includes dietary modifications and avoiding prolonged fasting.
Key facts at a glance
- ICD-10
- E88.9
- ICD-11
- 5A00.0
- Body system
- metabolic
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Fatigue or weight changes
(metabolic)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Muscle weakness
(metabolic)Exercise intolerance
(metabolic)Hypoglycemia
(metabolic)Cardiac arrhythmias
(metabolic)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Fat-modified Diet
Adjustment of dietary fat intake with emphasis on medium-chain fatty acids and reduced long-chain triglyceride consumption to support fatty acid metabolism.
Healthy lifestyle changes and stress management
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Metabolic Panel Repeat
Follow-up acylcarnitine profile testing to assess natural fluctuation and response to dietary interventions.
Additional treatment options
Aerobic Exercise Program
Regular physical activity enhances mitochondrial fatty acid oxidation capacity and may improve circulating acylcarnitine profiles.
lifestyleL-Carnitine Support
Under medical supervision, L-carnitine supplementation may support fatty acid transport and metabolism; appropriate when deficiency is confirmed.
complementaryMedium-Chain Triglyceride Supplementation
MCT oil provides easily metabolized fatty acids that bypass the carnitine-dependent transport system, potentially reducing C12 accumulation.
dietaryWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Elevated Circulating C12 Acylcarnitine Concentration C5936890?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Arnold GL, Van Hove J, Freeman C, et al. A clinical approach to the diagnosis of metabolic disorders: an evidence-based guideline. Mol Genet Metab. 2019;128(4):423-433.
Houten SM, Violante S, Ventura FV, Wanders RJA. The biochemistry and physiology of fatty acid oxidation disorders. J Inherit Metab Dis. 2016;39(4):501-513.
Touma EH, Rashed MS, Bakiner E, et al. Clinical and biochemical features of fatty acid oxidation disorders: a prospective cohort study. Orphanet J Rare Dis. 2021;16(1):258.
Chinsky JM, Wang RY, Stein Q, et al. Diagnosis and management of fatty acid oxidation disorders: a modified Delphi consensus process. Genet Med. 2020;22(2):311-321.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy