Laboratory Test Information Guide

Details for Vitamin C

Test Name: Vitamin C
Alternate Name(s): Ascorbic Acid
Laboratory: Toxicology/Special Chemistry
Specimen Type: 4.5 mL Green (Lithium Heparin) top Vacutainer tube

Serum is also acceptable.

Pediatric:
0-2 years: 0.5 mL Red Microtainer
2-10 years: 2 mL Red top tube
Collection Information: Fasting sample is recommended.

Protect sample from light by wrapping in foil.

Vitamin C results will not be provided on moderately or grossly hemolyzed plasma or serum due to oxidation of vitamin C that occurs with hemolysis.
Requisition: GENERAL LABORATORY REQUISITION
Test Schedule: Routine
Turnaround time from when specimen
is received in testing laboratory:
 
Routine
10 days
Stat
 
 
Reference Range: ≥ 25 µmol/L
Effective Date: 2009-07-02
Revised Date: 2021-03-22
Critical Value:  
Interpretive Comments: Vitamin C is very unstable to freeze/thaw cycles. If the specimen is allowed to thaw during processing and shipping, the vitamin C concentration will be very low or undetectable.
Special Processing: Protect sample from light, separate then freeze immediately.

Do not allow to thaw.
Comments:  
Method of Analysis: HPLC-MS/MS
Critical Information Required:  
Storage & Shipment: Separate and freeze. Do not allow the specimen to thaw at any time.
Any specimen that arrives at the laboratory thawed will not be tested.
System Codes: 
Cerner
VITC
 
Referred To:  

Questions? Comments? Contact Laura Gopaul