CPT/HCPCS
82507
Order Code
U003
Turnaround Time
24 hours
Test Includes
Citrate
Specimen Requirements
Specimen Source
Urine
Transport Container
(Specimen Container)
(Specimen Container)
Plastic screw-cap container
Preferred Specimens
10mL aliquot of a 24 hour urine
Minimum Volume (uL)
1.5 mL
Collection Instructions
(Transport Temperature)
(Transport Temperature)
Transport Refrigerated (cold packs)
Specimen Stability
| Temperature | Period |
|---|---|
| Room temperature | 8 hours |
| Refrigerated | 30 days |
| Frozen | 60 days |
Reject Criteria
Received room temperature; Acidified urine_x000D_
Special Instructions
Do not include first morning specimen; collect all subsequent voidings. The last sample collected should be the first morning specimen voided the following morning at the same time as the previous morning’s first voiding. Specify 24-hour total volume on container and test requisition.
Test Details
Methodology
Spectrophotometry (SP)
Clinical Significance
Citric Acid, 24-Hour Urine without Creatinine – Citrate binds to calcium and inhibits kidney stone formation. Thus, low concentrations of citrate may lead to kidney stone formation. This is the most important risk factor for kidney stone formation in children. The treatment of calcium stones involves increasing urinary citrate excretion
Reference Ranges
100 – 1300 mg/24 h
