Very Long Chain Fatty Acids
Also known as: Fatty Acid, VLCFA, Peroxisomal Disorders, X-ALD
Use
Peroxisomes play a vital role in several metabolic pathways, including the synthesis of plasmalogens and bile acids. They are also involved in the catabolism of very long chain fatty acids (VLCFAs), phytanic acid, and pristanic acid. Defects in these pathways usually result in the accumulation of one or more metabolites derived from the blocked metabolic steps. Specific accumulations are used for the differential biochemical diagnosis of numerous peroxisomal disorders, including Zellweger spectrum disorders, X-linked adrenoleukodystrophy (X‑ALD), X‑linked adrenomyeloneuropathy (X‑AMN), Refsum disease (phytanoyl‑CoA hydroxylase deficiency), and 2‑methylacyl‑CoA racemase deficiency.
Special Instructions
Not provided.
Limitations
Not provided.
Methodology
Mass Spectrometry
Biomarkers
Result Turnaround Time
5-7 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
Not provided
Minimum Volume
0.2 mL
Container
red‑top tube (no gel)
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.
Causes for Rejection
Hemolysis • Lipemia • Serum separator tube (SST) • Non‑fasting samples
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Unacceptable |
| Refrigerated | 7 days |
| Frozen | 28 days |
