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Methodology: Spectrophotometry (S)
Edit Date: 3/10/2008
Performed: Sunday, Tuesday, Thursday
Released: 1-7 days after setup at PeaceHealth Laboratories’ reference lab
CPT Code: 82180-90
Specimen Collection Details
Collection: One 10 mL green top tube (heparin). Fasting specimen preferred. Centrifuge immediately. Follow transport instructions carefully.
Handling: Centrifuge and separate plasma immediately. Add 2 mL heparinized plasma to each of two ARUP tubes containing 40 mg oxalic acid, available from Client Services. Mix and freeze. Critical frozen. Adequate preservation is 1 mL plasma per 20 mg oxalic acid. If other tests are ordered, send separate specimen for this test.
Stability: 2 months frozen with preservation. Specimen unstable ambient or refrigerated .
Standard Volume: 4 mL plasma.
Minimum Volume: 2 mL plasma.
Transport: Frozen on dry ice.
Comments: Vitamin C concentrations between 0.2 and 0.4 mg/dL indicate risk of deficiency. Concentrations less than 0.2 mg/dL are consistent with deficiency.
Rejection Criteria: Ambient, refrigerated, or specimen not preserved with oxalic acid; glass container; serum or hemolyzed plasma.

0.4-2.0 mg/dL

PeaceHealth Laboratories