Identifying vitamin C deficiency
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Portions of this test are covered by patents held by Quest Diagnostics
Ship specimen in amber vial to protect from light.
Patient Preparation: Fasting overnight (12-14 hours) (infants-collect prior to next feeding). Water can be taken as needed.
Supplies: Amber Frosted Tube, 5 mL (T192)
Collection Container/Tube: Green top (sodium or lithium heparin) or plasma gel separator (PST)
Submission Container/Tube: Amber vial
Specimen Volume: 1 mL
1. Immediately place specimen on wet ice and process within 4 hours of collection.
2. Centrifuge at 4 degrees C, aliquot plasma into amber vial to protect from light, and freeze immediately.
|Specimen Type||Temperature||Time||Special Container|
|Plasma Heparin||Frozen (preferred)||14 days||LIGHT PROTECTED|
Identifying vitamin C deficiency
Vitamin C, also known as L-ascorbic acid or simply ascorbic acid, is a water-soluble vitamin that is naturally present in some foods, added to others, and available as a dietary supplement. Humans, unlike most animals, are unable to synthesize vitamin C endogenously, so it is an essential dietary component. Vitamin C is required for the enzymatic amidation of neuropeptides, production of adrenal cortical steroid hormones, promotion of the conversion of tropocollagen to collagen, and metabolism of tyrosine and folate. It also plays a role in lipid and vitamin metabolism and is a powerful reducing agent or antioxidant. Specific actions include activation of detoxifying enzymes in the liver; antioxidation, interception and destruction of free radicals; preservation and restoration of the antioxidant potential of vitamin E; and blockage of the formation of carcinogenic nitrosamines. In addition, vitamin C appears to function in a variety of other metabolic processes in which its role has not been well characterized.
Prolonged deficiency of vitamin C leads to the development of scurvy, a disease characterized by an inability to form adequate intercellular substance in connective tissues. This results in the formation of swollen, ulcerative lesions in the gums, mouth, and other tissues that are structurally weakened. Early symptoms may include weakness, easy fatigue and listlessness, as well as shortness of breath, and aching joints, bones, and muscles.
The need for vitamin C can be increased by the use of aspirin, oral contraceptives, tetracycline, and a variety of other medications. Psychological stress and advancing age also tend to increase the need for vitamin C. Among older adults, lack of fresh fruit and vegetables often adds vitamin C depletion to the inherently increased need, with development of near-scurvy status
Values below 0.2 mg/dL indicate significant deficiency.
Values greater than or equal to 0.2 mg/dL and less than 0.4 mg/dL are consistent with a moderate risk of deficiency due to inadequate tissue stores.
Values of 0.4 to 2.0 mg/dL indicate adequate supply.
The actual level at which vitamin C is excessive has not been defined. Values above 3.0 mg/dL are suggestive of excess intake. Whether vitamin C in excess is indeed toxic continues to be uncertain. However, limited observations suggest that this condition may induce uricosuria and, in individuals with glucose-6-phosphate dehydrogenase deficiency, may induce increased red blood cell fragility.
Testing of nonfasting specimens or the use of vitamin supplementation can result in elevated plasma vitamin concentrations. Reference values were established in patients who were fasting.
After consuming vitamin C, plasma values rapidly rise within 1 to 2 hours and reach peak concentration within 3 to 6 hours after ingestion.
1.Vitamin C toxicity. Nutr Rev. 1976 Aug;34(8):236-237. doi: 10.1111/j.1753-4887.1976.tb05776.x 2
2. Moser U, Bendich A: Vitamin C. In: Machlin LJ, ed. Handbook of Vitamins. 2nd ed. Marcel Dekker; 1991:195-232
3. Ball GFM: Vitamins: Their Role in the Human Body. Blackwell Publishing; 2004:393-420
4. Zlatuse DC, Frank EL: Development and implementation of an HPLC-ECD method for analysis of vitamin C in plasma using single column and automatic alternating dual column regeneration. Prac Lab Med. 2016 Dec 1;6:25-37. doi: 10.1016/j.plabm.2016.09.001
5. Marshall WJ, Ayling RM: Nutrition: Laboratory and clinical aspects. In: Rifai N, Horvath AR, Wittwer CT, eds. Tietz Textbook of Clinical Chemistry and Molecular Diagnostics 6th ed. Elsevier; 2018:chap 56
Samples are diluted and extracted online extraction by high-turbulence liquid chromatography, with detection by tandem mass spectrometry.(Unpublished Mayo Method)
Monday through Friday
This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.
|Test Id||Test Order Name||Order LOINC Value|
|VITC||Ascorbic Acid, P||1903-4|
|Result Id||Test Result Name||
Result LOINC Value
Applies only to results expressed in units of measure originally reported by the performing laboratory. These values do not apply to results that are converted to other units of measure.
|8312||Ascorbic Acid, P||1903-4|