89690:HOMOCYSTEINE, TOTAL, URINE, QUANTITATIVE

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89690:HOMOCYSTEINE, TOTAL, URINE, QUANTITATIVE
Methodology: Spectrophotometry
Edit Date: 8/7/2006
Performed: Tuesday
Released: 2-10 days after setup at PeaceHealth Laboratories’ reference lab.
CPT Code: 83090-90
Specimen Collection Details
Collection: Two 5 mL aliquots from a well mixed 24-hour collection. Patient should abstain from Vitamin C ingestion 48 hours prior to collection. Do not add preservatives or acid to specimen. Also acceptable: Random samples. Refrigerate during collection.
Handling: Record 24-hour volume on tubes.
Stability: 24 hours refrigerated or 1 month frozen. Specimen unstable ambient.
Standard Volume: Two 5 mL aliquots.
Minimum Volume: 5 mL aliquot.
Transport: Frozen on dry ice.
Comments: Random samples are reported as homocysteine/creatinine ratios. Large amounts of hemoglobin or blood can interfere with quanitiation.
Rejection Criteria: Thawed specimen; pH <5.0 or >8.0; specimen with preservatives or acid.

Homocysteine, Urine 0-32 mg/d
Homocysteine per gram of creatinine 0-53 mg/g CR
Creatinine (24-hour) By report (reports may vary based on instrumentation)

PeaceHealth Laboratories