Very Long Chain Fatty Acids + Phytanic Acids
Label Mnemonic: VLCFA
Epic code: LAB4240
Downtime form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
Commercial Mailout Laboratory
6240-8 RCP
356-8593
Specimen(s):
Plasma
Specimen Instructions:
Patient Must not consume alchol for 24 hours before collection.
Collection Medium:
Lavender top tube 3 mL (EDTA)
Minimum:
Preferred Minimum: 1.5 mL EDTA plasma following an overnight (12-14 hour) fast
Absolute Minimum: 0.5 mL EDTA plasma following an overnight (12-14 hour) fast
Delivery Instructions:
Keep at room temperature. Do not refrigerate.
Turn Around Time:
2 weeks upon receipt at reference laboratory
Reference Range:
C22:0               < or = 96.3 umol/L
C24:0               < or = 91.4 umol/L
C26:0               < or = 1.30 umol/L
C24:0/C22:0 ratio   < or = 1.39
C26:0/C22:0 ratio   < or = 0.023

Pristanic Acid
0-4 mo:        < or = 0.60 umol/L
5-8 mo:        < or = 0.84 umol/L
9-12 mo:       < or = 0.77 umol/L
13-23 mo:      < or = 1.47 umol/L
> or = 24 mo:  < or = 2.98 umol/L

Phytatanic Acid
0-4 mo:        < or = 5.28 umol/L
5-8 mo:        < or = 5.70 umol/L
9-12 mo:       < or = 4.40 umol/L
13-23 mo:      < or = 8.62 umol/L
> or = 24 mo:  < or = 9.88 umol/L

Pristanic/Phytanic Acid Ratio
0-4 mo:        < or = 0.35
5-8 mo:        < or = 0.28
9-12 mo:       < or = 0.23
13-23 mo:      < or = 0.24
> or = 24 mo:  < or = 0.39
Comments:
Note: Patient's age is required on request form for processing. Include information regarding treatment, family history, and tentative diagnosis.
Methodology:
Capillary gas chromatography/mass spectroscopy of pentafluorobenzyl bromide fatty acid esters.
CPT Code:
82726
 
See Additional Information:
Fasting Specimen Requirements