Alberta Precision Laboratories

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Organization:

Alberta Precision Laboratories

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Test Name/Synonym:

Magnesium, Urine
Magnesium, 24 Hour Urine - Calgary Zone (CLS)

Test Code:

24 HOUR: UMGD AND U24H
RANDOM: UMG

Primary Container:

See Collection Information Below

Specimen Collection Requirements:

24 hour and Timed Collection:
Refrigerate during collection
Submit 5 mL aliquot of 24 hour urine collection preserved with Sulfamic acid.
Specimen may be acidified during or following collection.
See Specimen Handling and Additional Information sections for acidification instructions.
If Sulfamic acid is not available, HCl is also an acceptable preservative.
See HCl for Urine Preservation.

If test is ordered at the same time as Oxalate, collect with HCl instead of Sulfamic acid.
See Oxalate.

Random:
Submit 5 mL aliquot of acidified random urine collection.
Specimen may be acidified during or following collection.
See Specimen Handling and Additional Information sections for acidification instructions.

Processing:

Acidify specimen in original collection container.

ADULT Collection Type	Weight of Sulfamic acid in pouch for ADULT Collections
24 hr. collections on patients > 18yrs.	7 g pouch in each 4 liter container collection when acidifying during or after collection
Timed collections on patients > 18yrs.	Use 7 g pouch if >700 mL or when acidifying during collection 0.5 g pouch for every 100 mL collected when acidifying after collection up to 700 mL
Random collections on patients > 18yrs.	0.5 g pouch for every 90 mL collected (orange capped urine container - 90 mL) If less than 90 mL collected: send urine container to DSC Chemistry for acidification. DO NOT Aliquot. Clearly label - Not Acidified.
4 to 18 years Collection Type	Weight of Sulfamic acid in pouch for 4-18 yrs Collections
24 hr. collections on patients 4 to 18yrs.	7 g pouch in each 4 liter container collection when acidifying during or after collection
4 to 18 years timed collections	Use 7 g pouch if >700 mL or when acidifying during collection 0.5 g pouch for every 100 mL collected when acidifying after collection up to 700 mL
4 to 18 years random collections	0.5 g pouch for every 90 mL collected (orange capped urine container - 90 mL) If less than 90 mL collected: send urine container to DSC Chemistry for acidification. DO NOT Aliquot. Clearly label - Not Acidified.
Collection Type for NEWBORN to 4 YRS	Weight of Sulfamic acid in pouch for NEWBORN to 4 YRS
24 hr. collections on newborn to 4 yrs.	Use pre-acidification chart in Additional Information section
Random collections on newborn to 4 yrs.	0.5 g pouch for every 90 mL collected. If less than 90 mL collected: send urine container to DSC Chemistry for acidification. DO NOT Aliquot. Clearly label - Not Acidified.
Timed collections on newborn to 4 yrs.	0.5 g pouch for every 90 mL collected. If less than 90 mL collected: send urine container to DSC Chemistry for acidification. DO NOT Aliquot. Clearly label - Not Acidified. ACH only: 20-25 mL specimen - 1 x 0.1 g sulfamic acid 25-50 mL specimen - 2 x 0.1 g sulfamic acid >50 mL specimen - 1 x 0.5 g sulfamic acid

Aliquoting:
If acidified during urine collection:
Mix well and pour off 5 mL of acidified urine to aliquot tube.

If acidified following urine collection:
Add appropriate size and number of Sulfamic acid pouch(s), SHAKE bottle vigorously and LET SIT 15 minutes.
Mix and pour off 5 mL of acidified urine to aliquot tube.

RECORD 24 hour urine volume and collection (start and stop) dates and times in space provided on requisition.

Testing Schedule:

Test performed on a daily basis.

Reference Interval:

3.0 - 5.5 mmol/day

Testing Area:

Chemistry

Performing Site:

Diagnostic and Scientific Centre

Additional Test Information:

For Pre-acidification of Pediatric 24 hour Urines:

Age	Number of 0.5 g pouches to add when acidifying during collection
Up to 1 month	Not suitable for 0.5 g pouch Send original collection container to DSC Chemistry. Clearly label - Not Acidified.
1 to 2 months	2
2 to 4 months	3
4 to 12 months	4
12 months to 4 yrs.	5