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 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 2-8^oC.

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

CPT Codes

83735

LOINC Codes

19124-7

Volume

Preferred Volume: 0.5 mL

Minimum Volume: 0.2 mL

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.

Test Components

Urine Magnesium

Clinical Indications

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

Methodology

Colorimetric Endpoint Method Spectrophotometric (Roche Diagnostics)

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