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Test Code URMG (timed), RMG (random) Magnesium, Urine

Specimen Type

Urine, timed (24 hour) or random collection

Container

Urine,random or timed 24 hour

Preferred Volume

4 mL

Offsite Collection Instructions

Collect without additives in a metal free container.  Sample may be random or timed collection.

For timed specimens, send 10 mL of a well mixed sample. Indicate start and end time and total volume.

If collection duration is not specified, specimen will be considered a random sample.

UCMC Collection Instructions

Collect without additives in a metal free container.  Sample may be random or timed collection. 
If collection duration is not specified, specimen will be considered a random sample.

Availability

Random specimen: Sunday through Saturday 24/7; Timed specimen: Monday through Friday, 7:00 a.m. to 3:00 p.m.

Turnaround Time

Random specimen: 4 hours; Timed specimen: 24 – 72 hours

STAT Availability

Not Available

Test Usage

Urinary collection is valuable to detect magnesium deficiency due to gastrointestinal causes (eg, gut failure or Crohn's disease).

Test Methodology

Spectrophotometric, endpoint

CPT Code

URMG: 83735

RMG: 83735

Test Includes

quantitative analysis of magnesium in urine

Reference Range

Timed: 122 – 292 mg/24 hour
Random: Reference ranges for random urine specimens have not been established; subject to ordering physician interpretation only.

Critical Results

None

Minimum Volume

2 mL

Fee Code

URMG: 43427

RMG: 43427