Specimen:

Urine More information

Collection Medium:

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:

1 week

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

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