Acylcarnitine, Plasma

Test Code

Preferred Specimen
1 mL frozen Sodium heparin plasma collected in a: (green-top) tube

Minimum Volume
0.2 mL

Other Acceptable Specimens
1 mL frozen serum collected in  a: red-top tube (no gel)


Separate plasma by centrifugation as soon as possible. Avoid hemolysis. Remove plasma and place in plastic tube. Freeze immediately after separation. Date of birth is required.

Transport Container

Plastic, screw-capped, aliquot tube or vial

Transport Temperature
Frozen immediately

Specimen Stability
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received room temperature • Received refrigerated • Hemolysis

Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

Laboratory Developed Test

A low carnitine level may mask a disease state.

Reference Range
See Laboratory Report

Clinical Significance
Elevation of one or more acylcarnitines is diagnostic for an organic aciduria or a fatty disorder. A low carnitine level may mask a disease state.

Performing Laboratory
Quest Diagnostics Nichols Inst San Juan Capistrano
33608 Ortega Highway
San Juan Capistrano, CA 92690-6130

The CPT Codes provided in this document 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 payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.