Cystine, Leukocyte - Collect Mon-Thurs only. Must be delivered to UMMC Labs by 1500.


Sunquest Code:WBCYS  
Epic Code:LAB3879Epic Name:Cystine, Leukocyte
Synonyms:White Blood Cell Cystine; 1/2 Cystine; Leukocyte Cystine
Methodology:Tandem mass spectrometry; granulocyte half-cystine
CPT Code:----------CPTCODES HERE----------
Turnaround Time:Specimens are sent to reference laboratory Mon-Thur; results are reported within 2 weeks.
Special Instructions:

This test must be shipped the same day it is collected. Include a completed UCSD Biochemical Genetics Request Form (See Associated Links) with each sample including the exact collection time and the time of the patient's last medication. Diagnostic specimens require a control sample from an unrelated normal individual collected, processed and shipped in parallel.

 

Diagnostic specimens require a control sample from an unrelated normal individual collected, processed and shipped in parallel.

 

Patient and control sample must be refrigerated within 1 hour.

 

Associated Links:

UCSD Biochemical Genetics Request Form



Collection Instructions

Specimen:Blood
Optimal Volume:5 mL
Minimum\Peds Volume:3 mL
Collection Instructions:
Optimal collection time is immediately prior to the next dose (trough level).

Collect Mon-Thurs only and deliver to UMMC labs by 1500.

A control sample from an unrelated normal individual must be obtained at the same time as the patient sample for diagnostic specimens.
Causes for Rejection:Clotted or frozen specimens or specimens not refrigerated within 1 hour of collection. Diagnostic specimens arriving without a control sample.


Processing and Shipping

Specimen Processing:Refrigerate patient sample and control within 1 hour of collection. Do not process.
Shipping Instructions:Ship refrigerated. Samples must arrive in Specimen Management or ACL West Bank, Mon-Thur 0700-1500, to be sent to UCSD the same day.
Test Performed at or Referral Lab Lab Sendouts  (University of California, San Diego)


Interpretive

Reference Range:When blood is collected immediately prior to the medication dose, a value of <1.9 nmol/mg protein in granulocytes is found in >99% (the "3 sigma value") of samples from (asymptomatic) cystinosis carriers.
Use:To monitor cystinotic patients taking medication for cystinosis.


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