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 serum
Temperature: Frozen
Tube Type: Red-top or gel-barrier, protected from light
Collection Info:
Container: Red-top tube or gel-barrier 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:  Draw in chilled tube. Separate serum from cells as soon as possible following collection. Keep specimen on ice. Transfer specimen to a plastic transport tube before freezing. 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 five days at -30°C and one month at -70°C. There is a 61% decrease in levels in the first 24 hours following collection if the sample is allowed to remain at room temperature.

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

Specimen Acceptability

Causes for Rejection:  not received frozen; not protected from light


High-pressure liquid chromatography (HPLC) with electrochemical (EC) detection

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