ARUP's Laboratory Test Directory

Very Long-Chain Acyl-CoA Dehydrogenase Deficiency (ACADVL) Sequencing and Deletion/Duplication : 2004212
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Patient History for VLCAD
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Additional Technical Information


Mnemonic: VLCAD FGA

Ordering Recommendation: Diagnostic testing for VLCAD deficiency.
Methodology: Polymerase Chain Reaction/Sequencing/Multiplex Ligation-dependent Probe Amplification
Performed: Varies
Reported: Within 35 days
Specimen Required: Collect: Lavender (EDTA), pink (K2EDTA), or yellow (ACD Solution A or B).

Specimen Preparation: Transport 3 mL whole blood. (Min: 2 mL)

Storage/Transport Temperature: Refrigerated.

Stability (collection to initiation of testing): Ambient: 72 hours; Refrigerated: 1 week; Frozen: Unacceptable
Interpretive Data: Background Information for Very Long-Chain Acyl-CoA Dehydrogenase Deficiency/VLCAD (ACADVL) Deletion/Duplication:
Characteristics: Fatty acid beta-oxidation disorder leading to hypoketotic hypoglycemia, dicarboxylic aciduria, hepatic failure, Reye-like symptoms, cardiomyopathy, skeletal myopathy, and sudden death. Clinical presentation varies in severity and age of onset.
Incidence: Approximately 1 in 40,000.
Inheritance: Autosomal recessive.
Cause: Pathogenic ACADVL gene mutations.
Clinical Sensitivity: May be as high as 95 percent.
Methodology: Bidirectional sequencing of the entire coding region and intron-exon boundaries of the ACADVL gene. Multiplex Ligation-dependent Probe Amplification (MLPA) to detect large ACADVL coding region deletions/duplications.
Analytical Sensitivity and Specificity: 99 percent.
Limitations: Rare diagnostic errors can occur due to primer/probe site mutations. Regulatory region mutations and deep intronic mutations will not be detected; deletion/duplication breakpoints will not be determined.



Counseling and informed consent are recommended for genetic testing. Consent forms are available online at www.aruplab.com.

See Compliance Statement C: www.aruplab.com/CS
CPT Code(s): 81406, 81479
Cross References: VLCAD (Very Long-Chain Acyl-CoA Dehydrogenase Deficiency (ACADVL) Sequencing and Deletion/Duplication)