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Magnesium - Urine

Source Urine
Mnemonic 24 hour:  UMGD and U24H
Random:  UMG
Specimen 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.
Specimen Handling

Acidify specimen in original collection container.

 Patient Type

Collection Type 

 Weight of Sulfamic acid in pouch

 Newborn to 4 years

 24 hour

 Use pre-acidification chart in Additional Information section.

 Newborn to 4 years

 Random

 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.

 4 - 18 years 

 24 hour

 7 g pouch in each 4 liter container collection when acidifying during or after collection.

 18 - 150 years  Timed  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. 
 18 - 150 years  Random

 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.

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 of Sulfamic acid pouch, 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.

Additional 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

Testing Location Chemistry-DSC
Testing Frequency Daily
Alternate Name(s)
Reference Interval 3.0 - 5.5 mmol/day