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Test Name: Homocyst(e)ine, Plasma
Test Code: 706994
Other Names: N/A
Test Includes: Homocyst(e)ine, Plasma
Specimen Requirements: Plasma PREFERRED; serum is acceptable., 2 mL
Container: Lavender-top (EDTA) tube, green-top (Heparin) tube, red-top tube, or gel-barrier tube
Collection Instructions: Separate plasma or serum from cells immediately to avoid a false elevation of homocysteine. After one hour at room temperature, a 10% increase may be seen. Transfer plasma or serum to a plastic transport tube (See Causes for Rejection). Homocysteine results increase by approximately 35% and 75% for samples not centrifuged and/or not separated from the clot for periods of four and 24 hours, respectively. Serum values are expected to be higher than plasma values. Slightly higher values are observed in nonfasting patients.
Stability: Refrigerate Stability: Room temperature 14 days Refrigerated 14 days Frozen 6 months
Rejection Criteria / Special Instructions: N/A
Methodology: Enzymatic