Test Overview
Test Methodology

Tandem Mass Spectroscopy

Test Usage

Provides quantitative analysis of Cystine in wbc's

Reference Range *

Normal range: <0.2 nmoles 1/2 cys/mg protein

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

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.

Test Details
Days Set Up
Monday - Saturday
Analytic Time

8 - 10 days

Soft Order Code
Reference Laboratory
Baylor Medical Genetics (#4627)
Special Testing
Specimen Requirements

Collect specimen in an ACD yellow top tube. Sent to Specimen Processing in a green bag. Draw Monday - Thursday before 4 pm.

Special Handling

Draw Monday - Friday only (prefer Monday - Thursday) before 4 pm. Sample MUST arrive at Baylor within 36 hrs of collection.
Include a room temp ice pack to prevent temperature changes while shipping

Normal Volume
10 mL whole blood
Minimum Volume
3 mL whole blood
Storage Temperature
Strict ambient
Rejection Criteria
Specimens collected on Saturday or Sunday
Additional Information

Test is performed by Baylor College of Medicine, Medical Genetics

CPT Code
82542, 83789, 84155