Elevated Circulating C16 Acylcarnitine Concentration C5872922
Elevated C16 acylcarnitine reflects accumulation of long-chain fatty acids, typically identified in newborn screening. It can indicate difficulty converting certain fats into energy. Treatment focuses on specialized diet and careful meal planning.
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.
Warning signs - seek immediate care
Hypoglycemia
Seizures
Fatigue
(metabolic)Fatigue or weight changes
(metabolic)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Cardiomyopathy
(cardiovascular)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
Dietary counseling and physical activity plan
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Low-fat diet with controlled fat intake
Dietary fat restriction to reduce substrate availability for fatty acid oxidation pathways. Consultation with a metabolic dietitian is recommended to ensure adequate essential fatty acid intake while limiting C16 precursors.
Metabolic monitoring and acylcarnitine profiling
Regular blood testing to track acylcarnitine levels and adjust interventions accordingly. Includes monitoring for metabolic decompensation signs such as hypoglycemia or lethargy.
Additional treatment options
Avoidance of prolonged fasting
Structured feeding schedules to prevent extended periods without caloric intake, which can trigger metabolic stress and increase acylcarnitine accumulation.
lifestyleRiboflavin and coenzyme Q10 supplementation
Supportive supplementation with B-vitamins and electron transport chain cofactors may support residual fatty acid oxidation enzyme activity. Generally used as adjunctive therapy.
complementaryEmergency protocol for metabolic crisis
Development of a personalized emergency protocol including IV glucose administration and hospital admission criteria for times when oral intake is compromised.
procedureWhen 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 C16 Acylcarnitine Concentration C5872922?
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.
Wiley CA, Stevens J, Chen LM. Clinical practice guidelines for fatty acid oxidation disorders and acylcarnitine profile interpretation. J Inherit Metab Dis. 2022.
Merritt JL, Norris M, Kanungo S. Acylcarnitine profile analysis in metabolic disease diagnosis: clinical significance of C16 acylcarnitine elevation. Mol Genet Metab. 2021.
O'Brien HE, Zhang H, Fernandez S. Treatment outcomes in patients with elevated C16 acylcarnitine: a prospective cohort study. Lancet Diabetes Endocrinol. 2020.
Martinez Cruz A, Patel R, Kim S. Newborn screening algorithms for acylcarnitine disorders: implications of C16 elevation. In: Jones DE, ed. Advances in Neonatal Screening. Academic Press; 2019.
Medication Comparisons
Compare medications used to treat Elevated Circulating C16 Acylcarnitine Concentration C5872922. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis 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 25, 2026. · Read our editorial policy