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Test Code RMG Urine Magensium, Random

Important Note

If ordering a timed collection use order code URMG

Specimen and Container/Tube

Specimen Type: Urine, Random Collection

Preferred Specimen: Sterile Plastic Container

Other Acceptable specimens: Sterile Clean Glass Container

Specimen Stability

Storage Temperature

Stability

Room temperature

3 days

Refrigerated

3 days

Frozen

1 year (not preferred) 

Collection Instructions

  • Collect specimen per standard laboratory collection procedures. 
  • No preservatives or additives.

Specimen Handling and Transport Instructions

UCMC Onsite Instructions: 

  • Collect specimen per standard collection procedure and send to laboratory immediately. 
  • No preservatives or additives.

 

UCMC Offsite and UC MedLab Outreach Instructions: 

  • Samples should be centrifuged within 2 hours of collection
  • No preservatives or additives
  • Centrifuge specimens at >2500 x g for 10 minutes at room temperature.
  • Aliquot urine into plastic tube containing a minimum of 0.2 mL of specimen.
  • Urine samples must then be sent refrigerated at 2-8oC.

Rejection Criteria

  • Common specimen rejected situations include: incorrect specimen type, insufficient volume, missing or incomplete specimen identifiers, incorrect specimen transport, or specimens outside stability limits. 
  • Specimens that are collected with preservatives or additives.

Reference Values

Test

Age

Sex

Reference Range

Urine Magnesium

All

All

N/A

Critical Values

Not applicable 

Turnaround Time

Turnaround times are relative to the time the specimen is received in the test laboratory. 

STAT Turnaround Time: 1 hour

Routine Turnaround Time: 4 hours

Testing Schedule: 24/7

Clinical Indications

Urinary collection is valuable to detect magnesium deficiencydue to gastrointestinal causes (e.g, gut failure or Crohn's disease).

Test Components

Urine Magnesium 

CPT Codes

83735

 

LOINC Codes

19124-7

Methodology

Colorimetric Endpoint Method Spectrophotometric (Roche Diagnostics)

Synonyms/Keyword Search

Not applicable 

Additional Information

  • Results should always be assessed in conjunction with patient's medical history, clinical examination and other findings.
  • Reference ranges for random urine specimens have not been established; subject to ordering physician interpretation only.

Last Review Date

4/3/2025

Volume

Preferred Volume: 0.5 mL

Minimum Volume: 0.2 mL