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Test Code MG U QNT Magnesium, 24 Hour Urine

Clinical System Name

Urine Magnesium Quantitation, 24 Hours

Sample Requirements

Specimen: Urine

Container(s): 24 Hour Urine Jug

Preferred Vol: Entire volume from 24 hr collection.

Minimum Vol: N/A

 

Note:   Please contact lab to obtain urine container (no preservatives are needed) - go to Cinical Lab with patient label to obtain urine container.  Refrigerate sample during collection period.  Document start and stop dates/times, along with patient information.  Deliver labeled container to Clinical Lab upon completion.

 

Processing Instructions

Reject due to:

Spin: N

Aliquot:N

Temp: 2-8 C

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

 

Off-site collection: No preservatives are needed to start collection. Document start and stop dates and times, along with patient information. Send entire original container refrigerated.

Stability

Specimen Type Temperature Time
  Room temp  
  Refrigerated 7 d
  Frozen  

 

Availability

STAT Performed TAT
N M - F 1 - 3 d

 

Performing Laboratory

Seattle Children's Laboratory    

Department

Department:  Chemistry

Location: Chem East

Phone Number: (206) 987-2617

Reference Range

4 - 122 mg/ 24 h

 

Magnesium excretion exhibits a diurnal variation and is directly dependent on dietary intake.

Methodology

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

83735