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Test Code Homocystine Quant, Urine Homocystine Quant, Urine

Important Note

This test has been discontinued. Recommend a urine qualitative test for homocystine (order Sulfhydryl Groups Qualitative, Urine [LAB1966]) or Homocysteine, Total (LAB93) to rule out homocystinuria

Clinical System Name

Homocystine Quant, Urine

Description

Qualitative test for homocystine should be performed first (order Sulfhydryl Groups - Qualitative).

Sample Requirements

Specimen:Urine

Container(s): Sterile Screw-Capped Container, Tube or Syringe

Preferred Vol: 2.0 mL

Minimum Vol: 1.0 mL

 

Note:

 

Processing Instructions

Reject due to:

Spin: Y

Aliquot: Y

Temp: Frozen -20 C

Storage location: Biochemical Genetics Box

 

Off-site collection: Transfer urine to a plastic aliquot tube; freeze. Keep specimen frozen during transport.

Stability

Temperature Time
Room temp ≤ 2 hr
Refrigerated 24 hr
Frozen 1 month

 

Department

Department: Biochemical Genetics

Phone Number: 206-987-2216

 

Availability

STAT Performed TAT
N M-F 2-5 days

 

Methodology

Method: Ion exchange chromatography with post column ninhydrin derivatization

Analytical Volume: 0.1 mL urine

Limitations:

Reference Range

Not detected

CPT Codes

82131

Clinical Utility

Rule out homocystinuria; plasma total homocysteine is the preferrable sample.

Requisition

Biochemical Genetics Requisition

 

On the requisition include clinical information needed for appropriate interpretation.  (Age, gender, diet (e.g. TPN therapy), drug therapy and family history)