UCSD Biochemical Genetics

A Program in the Division of Genetics, Department of Pediatrics, University of California San Diego
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Test: Homocysteine, Total
Comments:Elevation of homocysteine is diagnostic for homocystinuria, and has been associated with vaso-occlusive and thrombotic disease. Where older methods only measured free homocystine, this method by tandem massspectrometry detects total (free and protein-bound, reduced homocysteine and oxidized homocystine).
Specimen type:Plasma
Sample Requirements:Plasma, 1 mL (minimum 0.5 mL) (separated from heparinized or EDTA-treated blood (green or purple-top tube), promptly frozen and shipped frozen (packed with dry ice) by overnight carrier.
Turnaround time:10-14 working days.