Oxalate
Order Code: OXALU
Epic Lab Code: LAB421
Order Form: A-1a Miscellaneous Request or Epic Req
Commercial Mail-out Laboratory
6240 RCP
356-3527
Specimen:
Urine More information
Collection Medium:
Urine - 24 hour/timed urine glass container with acid
Minimum:
24 hr collection with preservative of 10 mL 6N HCl added at start of collection. Preferred Minimum: 4.0 mL of well mixed 24 hr urine sample. Pediatric Minimum: 1.5 mL of well mixed 24 hr urine sample.
Rejection Criteria:
Urines not refrigerated during collection.
Delivery Instructions:
Submit specimen to laboratory as soon as possible after collection period is completed.
Specimen Instructions:
To properly aliquot sample for shipment to reference laboratory; once the 24 hr refrigeration sample is submitted to the Core Laboratory, the following will occur: 1) Thoroughly mix entire collection (24-hour or random) in one container; 2) Adjust pH to 1.5-2 with 6M HCl (approximately 10 mL HCl/24-hour specimen based on normal adult output of 1000-2000 mL/24 hours. Pediatric specimens will require < 10 mL to reach correct pH). Record total volume and collection time interval on transport tube and test request form. This information is required for test interpretation.
Analytic Time:
4 days upon receipt in reference laboratory
Reference Range:
Components Reference Interval Creatinine (24-hours) Male 3-8 years: 140-700 mg/d 9-12 years: 300-1300 mg/d 13-17 years: 500-2300 mg/d 18-50 years: 1000-2500 mg/d 51-80 years: 800-2100 mg/d 81 years and older: 600-2000 mg/d Female 3-8 years: 140-700 mg/d 9-12 years: 300-1300 mg/d 13-17 years: 400-1600 mg/d 18-50 years: 700-1600 mg/d 51-80 years: 500-1400 mg/d 81 years and older: 400-1300 mg/d Oxalate, Urine 0-12 years: 13-38 mg/d Male 13 years and older: 7-44 mg/d Female 13 years and older: 4-31 mg/d
Interpretive Data:
Reference intervals for random urine samples (mg/L) are not available.
Comments:
Urine should be refrigerated during collection. Submit dates and times of collection on requisition. Record total volume and collection interval on transport tube.
Test Limitations:
Since vitamin C (ascorbic acid) quickly degrades to oxalate in nonacidified urine, patient should consider refraining from vitamin C supplements during and for 48 hours prior to urine collection for oxalate.
Methodology:
Spectrophotometry
CPT Code:
83945
 
See Additional Information:
Urine Tests Requiring Preservatives, Refrigeration or Special Containers