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Beaumont Laboratory

Vitamin C Level

Vitamin C, Plasma, Ascorbic Acid, Plasma, WARDE: VITC, Antrim #81980, EPIC: LAB6181, SOFT: XVITC


  • The patient should be fasting overnight (12-14 hours) prior to specimen collection. For infants, collect specimen prior to next feeding. Water can be taken as needed.
  • Refrain from taking vitamin C for 24 hours prior to collection.

Specimen Collection Criteria

Collect: One Dark Green-top Lithium or Sodium Heparin tube.
Also acceptable: One plain Red-top or Gold-top SST tube.

  • Protect specimen from light.
  • Place specimen on ice after draw.
  • Specimen must be processed within 2 hours of collection.
  • Separate samples must be submitted when multiple tests are ordered.

Physician Office/Drawsite Specimen Preparation

Critical frozen. Protect specimen from light. Centrifuge specimen immediately. Transfer plasma or serum to an amber plastic transport tube and freeze (-20°C/-4°F or below). 

Preparation for Courier Transport

Transport: 2.0 mL light-protected plasma or serum, frozen (-20°C/-4°F or below). (Min: 1.0 mL)

Rejection Criteria

  • Grossly hemolyzed specimens.
  • Specimens not protected from light.
  • Specimens not collected and processed as indicated.


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 2 hours
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): 5 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Sendout Laboratory with any questions.


Sent to Warde Medical Laboratory, Ann Arbor, MI.


Monday, Wednesday, Friday.
Results available in 3-5 days.

Reference Range

2-19 mg/L.

Test Methodology

High-Performance Liquid Chromatography (HPLC).


By report.

Clinical Utility

Vitamin C facilitates the absorption of dietary iron and is involved in a number of other metabolic pathways.

CPT Code


Test Codes

WARDE: VITC, Antrim #81980, EPIC: LAB6181, SOFT: XVITC

Last Updated


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This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.