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Genetic Labs

Houston, Texas

Genetic Laboratory
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Medical Genetics Test Details

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White Blood Cell Cystine
Cystinosis | Intermediate Cystinosis | Nephropathic Cystinosis | Non-Nephropathic Cystinosis
Test Information: This tests provides quantitative analysis of Cystine in White Blood Cells. This test allows confirmation of the clinical diagnosis of Cystinosis.
Test Details
Test Code: 4627
Special Notes: White Blood Cell cystine levels are sensitive to sample handling and can decrease with time. When whole blood is sent to the laboratory, it is extremely important that the sample arrive in our laboratory within 36 hours of sample draw.

This test should not be shipped for Saturday delivery.

On March 12, 2013, our biochemical laboratory started to use an optimized protocol for cystine determination in white blood cells for test code 4627. This protocol change minimizes the loss of cystine during sample preparation. The normal cystine range is not affected by this change; however, as a result of the protocol change, the cystine level reported may be increased in cystinosis patients. This apparently elevated level may lead to concern for patient non-compliance when compared with previous results. Please take this method change into consideration when monitoring the patient's cystine levels.
Technical Information
Methodology: Tandem Mass Spectroscopy
Test Type: Analyte Analysis
References Values or Ranges: Normal Range:
White Blood Cells: < 0.2 nmoles 1/2 cys/mg protein
Cystinosis: 4.0-13.2 nmol 1/2 cys/mg protein
Sample & Shipping Information
Test Requisition: Biochemical
Specimen Type: White Blood Cells
Requirements: Draw blood in an ACD (yellow-top) tube(s) and send 7-10 ml (Adults/Child) or 5-7 ml (<2yrs).
Shipping Conditions: Ship at room temperature in an insulated container by overnight courier to arrive within 36 hours of collection. Do not heat or freeze.

Turn Around Time: 8 days
Billing Information
List Price: *For Insurance or Institutional Prices, please call.
CPT Codes: 82543 x 1, 84155 x 1


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