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.|
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.
|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|
|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|
|List Price:||*For Insurance or Institutional Prices, please call.|
|CPT Codes:||82542x1, 84155x1|