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Test Code MG U Magnesium, Urine Random

Clinical System Name

Urine Magnesium

Sample Requirements

Specimen: Urine

Container(s): Sterile screw-capped container, Clean container also acceptable.

Preferred Vol: 5 mL

Minimum Vol: 2 mL


Note: Timed collection is preferred (24 hours). Deliver labeled jug to Clinical Lab upon completion.


Processing Instructions

Reject due to:

Spin: N


Temp: 2-8 C

Storage location: Store original container and labels in CPA refrigerator, FrigB bucket.


Off-site collection: Send original container refrigerated.


Specimen Type Temperature Time
  Room temp 7 d
  Refrigerated 7 d
  Frozen 1 m



STAT Performed TAT
N M - F 1 - 3 d


Performing Laboratory

Seattle Children's Laboratory    


Department:  Chemistry

Location: Chem East

Phone Number: (206) 987-2617

Reference Range

No reference range available for random collections. Magnesium excretion exhibits a diurnal variation and is directly dependent on dietary intake.


Method: Spectrophotometry by Vitros 4600

Analytical Volume: 0.5 mL

Limitations: Method is affected by fecal contamination, loss of specimen during collection, Loss of 10% of total urine collected invalidates the test.

CPT Codes