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Test Code 24MG Magnesium, urine, 24 hr

Additional Codes

Epic Ordering Code LAB406
NBS code LBC04637
Service code 31306

Specimen Requirements

Submit the following:

Container:
24 Hr Urine Container

Preservative types accepted: No preservative, Thymol

Submit cumulative 24-hour urine collection, or a 20 mL aliquot from the completed collection. For aliquots, record the total 24-hour urine volume on the bottle.

 

NUH Outreach: Submit a 20 mL aliquot from the completed 24-hour collection. Record the total 24-hour urine volume on the aliquot bottle.

Processing Requirements

Centrifuge sample before analysis.

Specimen type: 24hr Urine

Specimen Stability

Specimen Type 24 hr urine
Ambient 2 days
Refrigerate 2 days
Frozen 1 year

Specimen Condition

Haemolysis Not applicable
Icterus Not applicable
Lipaemia Not applicable
Others Not applicable

Methodology

Enzymatic Assay

Days and Times Performed

24 hrs, TAT 1 day

Reference Interval

3.0 – 5.0 mmol/day

Testing Laboratory

National University Hospital

Clinical Chemistry, 67724346

Useful For

Assessment of the cause of abnormal serum magnesium concentrations.

Update

Last updated 31/07/2026

LOINC Code Information

Urine volume, total 3167-4
Magnesium, urine 2598-1
Magnesium, urine, 24 hr 2599-9

Alias

24MG