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Genetic Labs

Houston, Texas

Genetic Laboratory
Baylor Genetics Laboratories
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Medical Genetics Test Details

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The American Medical Association (AMA) Current Procedural Terminology (CPT) codes and Healthcare Common Procedure Coding System (HCPCS) codes listed, are provided for informational purposes only. The codes reflect our interpretation of CPT/HCPCS coding requirements based upon AMA guidelines published annually. CPT/HCPCS codes are provided only as guidance to assist clients with billing. Baylor Genetics strongly recommends that clients confirm CPT/HCPCS codes with their Medicare Administrative Contractor (MAC) or other payer being billed, as requirements may differ. CPT coding is the sole responsibility of the billing party. Baylor Genetics assumes no responsibility for billing errors due to reliance on the CPT codes listed. Please direct any questions regarding CPT coding to the payer being billed.

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 and monitoring 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 Sunday 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
Cystine-depleting therapy target: < 1 nmol 1/2 cys/mg protein (See GeneReviews: Cystinosis)
Sample & Shipping Information
Test Requisition: Biochemical
Specimen Type: White Blood Cells
Requirements: Draw blood in ACD (yellow-top) tubes. For adult and children 2 years of age and older, 5-10 ml should be drawn; for children under 2 years of age, 3-5 ml should be drawn.
Shipping Conditions: Ship at room temperature in an insulated container by overnight courier to arrive within 36 hours of collection. To help maintain the integrity of the sample it is recommended to ship the sample with a freezer gel pack. Do not heat or freeze.

Turn Around Time: 8 days
Billing Information
List Price: *For Insurance or Institutional Prices, please call.
CPT Codes: 82542x1, 83789x1, 84155x1

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