Medium Chain Acyl-CoA Dehydrogenase (MCAD) Deficiency

Medium-chain acyl-CoA dehydrogenase (MCAD) deficiency is the most common disorder of fatty acid oxidation. Newborn screening by tandem mass spectrometry reveals the accumulation of octanoylcarnitine, which is characteristic of MCAD deficiency. Symptoms that typically occur between 6 months to two years include lethargy, hypoglycemia, vomiting, hypotonia, seizures and sudden infant death syndrome. Complications include hepatic dysfunction, respiratory difficulties, cardiac arrest, neurologic deficits and coma. The disorder is characterized by high mortality however milder variants exist and adult onset can occur. Significant phenotypic heterogeneity may occur even within a family.

Tests Available

Forms and Documents

Test Details

  • Confirmation of a biochemical diagnosis
  • Carrier testing
  • Prenatal diagnosis in at risk pregnancies


4 weeks
2-5 mL Blood - Lavender Top Tube
Buccal Swabs | Extracted DNA

*Reporting times are typical, but could be extended in situations outside GeneDx's reasonable control.


  • 277.85 Disorders of fatty acid oxidation, Carnitine palmitoyltransferase deficiencies, Glutaric aciduria type II, Long chain 3-hydroxyacyl CoA dehydrogenase deficiency (LCHAD), Long chain/very long chain acyl CoA dehydrogenase deficiency, Medium chain acyl CoA dehydrogenase deficiency (MCAD), Short chain acyl CoA dehydrogenase deficiency (SCAD)
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**The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.