General Information

HLAB/HOL Code: FA826
UPHSM LIS Test #: 028464
Testing Time: 3-5 Days
Testing Lab: Mayo

Specimen Info
Only 1 specimen type required, unless otherwise specified

Volume: 0.5 mL
Temperature: Frozen
Tube Type: Serum
Collection Info:
Patient Preparation:
1. For nutritional assessment, patient should fast overnight (12-14 hours); for patients with a suspected fatty acid oxidation disorder, collect prior to next feeding as fasting is contraindicated.
2. Patient must not consume any alcohol for 24 hours before the specimen is collected.
Include information regarding treatment, family history, and tentative diagnosis.
Preferred: Red top
Acceptable: Serum gel

Specimen Acceptability

Gross hemolysis: OK
Gross lipemia: Reject
Gross icterus: OK


Gas Chromatography-Mass Spectrometry (GC-MS) Stable Isotope Dilution

Clinical Utilities

Monitoring patients undergoing diet therapy for mitochondrial or peroxisomal disorders (possibly inducing essential fatty acid deficiency in response to restricted fat intake) using serum
Monitoring treatment of essential fatty acid deficiency
Monitoring the response to provocative tests (fasting tests, loading tests)

This test is not the recommended initial screening test for evaluating patients with possible peroxisomal disorders, single-enzyme defects of peroxisomal metabolism such as X-linked adrenoleukodystrophy, or peroxisomal biogenesis disorders (Zellweger syndrome spectrum). For these purposes, the preferred tests are either POXP / Fatty Acid Profile, Peroxisomal (C22-C26), Plasma or POX / Fatty Acid Profile, Peroxisomal (C22-C26), Serum.

CPT Codes


* The CPT codes provided are based on AMA guidelines 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.

Reference Range

see separate ranges sent with report