Very Long-Chain and Branched-Chain Fatty Acids Profile
Test Mnemonic
FATLON
CPT Codes
- 82726 - QTY (1)
Includes
- Pristanic Acid
- Phytanic Acid
- Ratio Pristanic Acid to Phytanic Acid
- C22:0 Behenic Acid
- C24:0 Tetracosanoic Acid
- C26:0 Hexacosanoic Acid
- Ratio C24:0 to C22:0
- Ratio C26:0 to C22:0
Performing Laboratory
ARUP
FDA Category
Laboratory Developed Test
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL | Plasma | Sodium or Lithium heparin (Green) | Frozen, Critical | CRITICAL FROZEN. Patient Prep: Fasting specimen is preferred for adults. For infants and children, draw specimen prior to feeding or 2-3 hours after a meal. Separate plasma from cells and transfer into a standard aliquot tube. Freeze immediately. Must submit Biochemical Genetics Patient History Form with the specimen. Separate specimens must be submitted when multiple tests are ordered. |
Alternate Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL | Plasma | EDTA (Lavender) | Frozen, Critical | CRITICAL FROZEN. Patient Prep: Fasting specimen is preferred for adults. For infants and children, draw specimen prior to feeding or 2-3 hours after a meal. Separate plasma from cells and transfer into a standard aliquot tube. Freeze immediately. Must submit Biochemical Genetics Patient History Form with the specimen. Separate specimens must be submitted when multiple tests are ordered. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.2 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Frozen | After separation from cells: 1 month |
| Refrigerated | After separation from cells: 72 hours |
| Ambient | After separation from cells: 24 hours |
Days Performed
Tue
Turnaround Time
3 - 10 days
Methodology
| Name | Description |
|---|---|
| Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) |
Special Info
CRITICAL FROZEN. Clinical information is needed for appropriate interpretation. Age, gender, diet (e.g.,TPN therapy), drug therapy, and family history are also required. Patient Prep: Fasting specimen is preferred for adults. For infants and children, draw specimen prior to feeding or 2-3 hours after a meal. Must submit Biochemical Genetics Patient History Form with the specimen. Separate specimens must be submitted when multiple tests are ordered. Room temperature specimens greater than 24 hours and refrigerated specimens greater than 48 hours are unacceptable. Specimens exposed to more than one freeze/thaw cycle are not acceptable. This test is New York DOH approved.
Clinical Info
This is an initial test to screen for disorders of peroxisomal biogenesis and/or function, including X-linked adrenoleukodystrophy and Zellweger syndrome.