Test Directory

• Pristanic Acid
• Phytanic Acid
• C22:0 Behenic Acid
• C24:0 Tetracosanoic Acid
• C26:0 Hexacosanoic Acid
• Ratio Pristanic to Phytanic
• Ratio C24:0 to C22:0
• Ratio C26:0 to C22:0

Initial test to screen for disorders of peroxisomal biogenesis and/or function, including X-linked adrenoleukodystrophy and Zellweger syndrome. This test does not detect essential fatty acid deficiency and should not be used to evaluate nutritional status.

Specimen Type: Plasma

Collection Container: Green Top (Sodium or Lithium Heparin)

Alternate Collection Container: Lavender Top (EDTA)

Desired Specimen Volume: 0.5 mL

1. Collect a green top (sodium or lithium heparin) tube via venipuncture.

1. Separate plasma from cells within 45 minutes of collection.
2. Transfer 0.5 mL of plasma to a clear aliquot tube (screw cap).
3. Separate specimens must be submitted when multiple tests are ordered.
4. Submit a Patient History for X-Linked Adrenoleukodystrophy (ABCD1) Genetic Testing with the sample for appropriate result interpretation.

Adults: Fasting specimen preferred.

Infants and children: Draw specimen prior to feeding or 2-3 hours after a meal.

Transport to the laboratory frozen. 

• Room temperature specimens greater than 24 hours
• Refrigerated specimens greater than 48 hours
• Specimens exposed to more than one freeze/thaw cycle

 See patient report.

• VLCFA and BCFA
• Very Long-Chain and Branched-Chain Fatty Acids Profile