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OXA24 / 003970L
OXALATE, 24-HOUR URINE

Test Code OXA24 / 003970L 
Test OXALATE, 24-HOUR URINE 
Methodology Enzymatic 
Description Useful to work up nephrolithiasis 
Specimen 10 mL (minimum volume: 2.5 mL) aliquot from a 24-hour urine collection. Add 30 mL 6N HCI at the end of collection within 4 hours of completion of collection. Final pH must be between 1 and 3. For multiple collections, see "Urine Preservatives". Mix well before aliquot is taken. Send refrigerated. Note 24-hour volume on the requisition form. For additional collection instructions, see "Urine Collection".

NOTE: Patient must avoid vitamin C supplements and vitamin C rich foods (eg, citrus fruits like oranges, orange juice; vegetables like broccoli, tomatoes, peppers, potatoes) for 48 hours prior to collection. 

Reference Values Children:
< 7 years: Not established
7 - 14 years: 13 - 38 mg/24 hours

Adults:
Male: 7 - 44 mg/24 hours
Female: 4 - 31 mg/24 hours 

Analytic Time 2 Days 
Day(s) Test Set Up Monday through Friday 
CPT Code(s) 83945  

Special Instructions