Very Long Chain Fatty Acids
Test code
CPT code(s)*
Clinical significance
Test resources
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Details
Includes
Phytanic Acid
Pristanic Acid
Docosanoic, C22:0
Tetracosanoic, C24:0
Hexacosanoic, C26:0
Ratio C24/C22
Ratio C26/C22
Ratio Pristanic/Phytanic
Interpretation
Methodology
Gas Chromatography/Tandem Mass Spectrometer
Assay category
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Alternative name(s)
VLCFA,X-ALD,Fatty Acid,Peroxisomal Disorders
Specimen requirements | |
|---|---|
| Patient preparation | Fasting required (overnight fast). No alcohol consumption for 24 hours prior to draw. For pediatric patients, fasting is not required, but sample collection should occur prior to the next meal or scheduled feeding. |
| Preferred specimen(s) | 1 mL serum collected in red-top tube (no gel) |
| Alternative specimen(s) | Plasma collected in: EDTA (lavender-top) tube |
| Minimum volume | 0.2 mL |
| Collection instructions | Patient age and gender are required for reporting |
| Transport container | Transport tube |
| Transport temperature | Frozen |
| Specimen stability | Room temperature: Unacceptable Refrigerated: 7 days Frozen: 28 days |
| Reject criteria | Hemolysis • Lipemia • Serum separator tube (SST) • Non-fasting samples |
Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
*The CPT codes provided are based on AMA guidance 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.
This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.
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