General Information

UPHSM LIS Test #: 5884
Testing Time:
Testing Lab: Labcorp

Specimen Info
Only 1 specimen type required, unless otherwise specified

Volume: 1.0 (0.5) mL PLASMA
Temperature: Frozen
Tube Type: Green top (lithium heparin), protected from light
Collection Info:
Container: Green top (lithium heparin) tube; amber plastic transport tube with amber-top. (If amber tubes are unavailable, cover standard transport tube completely, top and bottom, with aluminum foil. Identify specimen with patient name directly on the container and on the outside of the aluminum foil. Secure with tape.)

Collection:  Collect blood into a green-top lithium heparin and mix immediately by gentle inversion at least six times to ensure adequate mixing. Plasma must be separated from cells immediately following collection and transferred to a light-protected amber tube. Separated plasma must be on ice. Protect specimen from light.
To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Storage Instructions:  FREEZE IMMEDIATELY AND PROTECT FROM LIGHT. Stable for fourteen days frozen.

Patient Preparation:   Refrain from taking vitamin C supplements or fruits 24 hours prior to sample collection.

Specimen Acceptability

Causes for Rejection:  Anticoagulants other than lithium heparin; not received frozen; not protected from light.


Liquid chromatography-tandem mass spectrometry (LC/MS-MS)

Clinical Utilities

Evaluation of vitamin C deficiency

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

• 0-11 months: Not established
• 1-12 years: 0.2-2.3 mg/dL
• 13+ years: 0.2-2.0 mg/dL