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80313M
XANTHINE AND HYPOXANTHINE, 24-HOUR URINE

Test Code 80313M 
Test XANTHINE AND HYPOXANTHINE, 24-HOUR URINE 
Methodology Liquid Chromatography - Tandem Mass Spectrometry (LC-MS/MS) 
Description Useful for diagnosis and confirmation of xanthinuria and evaluation of low serum or urine uric acids and of allopurinol treatment in hyperuricemic disorders (e.g. Lesch-Nyhan syndrome). 
Specimen 5.0 mL (minimum: 0.5 mL) from a 24-hour urine collection. No preservative. See "Urine Preservatives" for multiple collections. Send specimen FROZEN in plastic container in a plastic, 13-mL urine tube.

NOTE:
1. 24-HOUR VOLUME IS REQUIRED ON REQUEST FORM FOR PROCESSING.
2. Follow "Urine Collection" instructions. 

Reference Values HYPOXANTHINE
20 - 100 Ámol/24 hours

XANTHINE
20 - 60 Ámol/24 hours 

Analytic Time 2 Days 
Day(s) Test Set Up Varies; One time per week 
CPT Code(s) 83789  

Special Instructions