Oxalate

Extra-regional sites: see Oxalate, Extra-regional

20 mL aliquot of acidified 24 hour urine collection.

Newborn to Adult:
Refer to charts in Specimen Handling and Additional Information sections.

REFRIGERATE during collection.
Urine specimen collection container must have preservative
pouch(es) added prior to collection.

Acidify specimen in original collection container.

RECORD 24 hour volume and collection (start and end) dates and time in
space provided on requisition.

Mix well and pour off acidified aliquot.
Sample pH should be <3.0.

ADULT Collection Type	Weight of Sulfamic acid in pouch for ADULT Collections
24 hr. collections on patients > 4 yrs.	7 g pouch in each 4 liter container collection
Adult timed collections	7 g pouch in each 4 liter container collection
Adult random collections	0.5 g pouch for every 100 mL collected (orange capped urine container = 100 mL)

Random samples from children can be analyzed if collected at
Alberta Children’s Hospital or may be collected on hospital inpatients if
delivered to the Lab immediately.
Adjust sample pH to <3.0 with Sulfamic acid immediately after collection.

For Acidification of Pediatric 24 hour Urines:

Age	Number of 0.5 g pouches of Sulfamic acid to add when Acidifying During Collection
Up to 1 month	Not suitable for 0.5 g pouch Refer patient to ACH
1 up to 2 months	2
2 up to 4 months	3
4 up to 12 months	4
12 months up to 4 yrs.	5