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HelpTest Code LAB406 Magnesium, 24 Hour Urine
Clinical System Name
Urine Magnesium Quantitation, 24 Hours
Synonyms
MG U QNT
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 | 7 d | |
| Refrigerated | 7 d | |
| Frozen | 1 m |
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
CPT Codes
83735
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.
Reference Range
4 - 122 mg/ 24 h
Magnesium excretion exhibits a diurnal variation and is directly dependent on dietary intake.