Vitamin C
Label Mnemonic: VTC
Epic Lab Code: LAB4253
Downtime Form: A-1a Miscellaneous Request
Commercial Mail-out Laboratory
5231 RCP
Collection Medium:
Plasma Separator Tube 4.5 mL
Preferred Minimum: 0.5 mL plasma
Absolute Minimum: 0.3 mL plasma
Rejection Criteria:
EDTA plasma, whole blood, or body fluids. Grossly hemolyzed specimens.
Delivery Instructions:
Wrap tube in aluminum foil to protect from light. IMMEDIATELY place tube in ice and delivery to the laboratory.
Turn Around Time:
1-6 days upon receipt at reference laboratory
Reference Range:
23-114 μmol/L
Interpretive Data:
Vitamin C concentrations lower than 11 μmol/L indicate deficiency. Concentrations between 11 and 23 μmol/L are consistent with a moderate risk of deficiency due to inadequate tissue stores.

Vitamin C concentration is reported as micromoles per liter (μmol/L). To convert concentration to milligrams per deciliter (mg/dL), multiply the result by 0.0176.
Note: Fasting specimen preferred. Thawing and refreezing of the specimen and exposure to light will result in decreased Vitamin C concentration.
Quantitative High Performance Liquid Chromatography
CPT Code:
See Additional Information:
Specimens Requiring Immediate Delivery