MAGNESIUM, urine (087-0465)
CPT 4 Code: 83735
Test Order Mnemonic: MG UR
Test Includes: Volume and hours of collection,
concentration, and amount excreted
Lab: Clinical Chemistry
Request Form: Write in on Routine Chemistry Form 1
Collection: 24-hour Urine - Discard early morning
specimen; start timing from this point. Collect all urine for the next 24 hours, including
sample voided at the same time the next morning. Note the time of the last collection on
the request form.
Storage Instructions: 2-8°C during collection and
until delivered to laboratory
Causes for Rejection: Collection with preservative,
improper labeling
Availability: Samples are received 24 hours per day
at Sample Management, Room 5.136 McCullough.
Turnaround Time: 24-48 hours
Special Instructions: Record start and finish times
of collection on the request slip.
Specimen: Urine
Volume: Preferred: entire collection; Acceptable:
aliquot, if volume is measured and written on the request slip
Minimum Volume: 7 mL
Container: 2 liter brown plastic jug or red top tube
without any additives
Reference Ranges: 73-290 mg/24 hours
