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Test Code LAB5239 MAGNESIUM, URINE, 24 HOUR

Specimen Type

24-hour urine collection

Collection Instructions

Collect a 24-hour urine in a 24-hour dark plastic urine container. Do not use preservatives. Refrigerate during collection. Record collection dates and start/stop times. Deliver to the laboroatory on ice.

Specimen Volume

40-60 mL

Minimum Volume

40 mL

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Specimen Stability

Room Temperature: 3 days

Refrigerated: 3 days

Frozen: 1 year

Specimen Processing

Record collection time and total volume.

Invert 24 hour urine container several times to mix the specimen.
Aliquot 40-60 mL of a well-mixed 24-hour urine collection into a leakproof plastic urine container.

Adjust to pH <2 with 6N HCl

Centrifuge urines containing visible precipitates.

Method

Colorimetric

Reference Ranges

72.90 - 121.50 mg/24h

Synonyms

Mg, Urine

Test Components

Collection Period, h; Volume, mL; Magnesium, Urine, mg/24h.

CPT Codes

83735

Specimen Rejection

Specimens contaminated with fecal material or meconium will be rejected.