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Magnesium, Urine, Timed

Mnemonic

U TM MG

Synonym

Urine Magnesium - Mg++ - MG

Includes

Urine Magnesium, Urine Magnesium/Day

Specimen Collection Requirements

Collect

Preferred: 24 hour urine, metal-free container, without preservatives, refrigerate during collection. Also acceptable: Other timed urine collections.

Handling

Collect urine over 24 hours. Refrigerate during collection. Mix urine well before removing aliquot. Record collection time interval and total volume on the transport tube and test request form. Legacy Laboratories will adjust the pH to 2 with 6N HCl before testing occurs.

Preferred Volume

5.0 mL urine

Minimum Volume

2.0 mL urine

Transport

Refrigerated (2-8°C)

Stability

Room Temperature (18-26°C): 2 hours; Refrigerated (2-8°C): 7 days; Frozen (≤-20°C): 1 month

Testing Information

Performed

7 days/week

Reported

24 hours

Method

Colorimetry

Reference Values

Reference Values

50-200 mg/day

Comments

Eltrombopag and its metabolites may interfere with this assay causing erroneously high patient results.

CPT Codes

83735

Last Updated: Wednesday, February 3, 2021 12:44:53 AM


Client Services: 503-413-1234