Magnesium, Timed Urine

Abbrev Code:UMGT   
Order Code:LAB3842Order Name:Magnesium Timed Urine
Order Instructions:Order UCRT in addition to UMGT. Enter collection volume and duration.
Methodology:Bichromatic endpoint
St Joseph: Enzymatic
CPT Codes: 83735 x1, 81050 x1
Test Includes:Urine magnesium and creatinine.
Turnaround Time:Performed and reported 24 hours/day.
Associated Links:

Urine Collection Procedure

Collection Instructions

Specimen:Urine, timed collection (20-28 hours)
Optimal Volume:Submit entire collection; analysis requires 1 mL
Container:3 L plastic jug

Processing and Shipping

Specimen Processing:Mix collection well before aliquot is taken. Aliquot 5 mL, 1 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Stability:Urine containing bladder fluid is acceptable. Enter coded comment IRRFL (urine contains bladder irrigation fluid).
Test Performed at or Referral Lab Chemistry  (UMMC-West Bank, UMMC-East Bank, St. Joseph's)


Reference Range:Grand Itasca/St Johns/St Joseph/Woodwinds (all ages, M/F):  N/A
All Other Sites
Age Female
0-2 y N/A N/A
3-8 y 0.11-0.68 0.11-0.68
9-12 y 0.17-1.41 0.17-1.41
13-17 y 0.29-1.87 0.29-1.87
18 y & older 0.8-1.8 1.0-2.0
All Units: mg/24 hours
All 73-122
Use:As an index of repletion of magnesium deficiency in hypomagnesemia; to rule out renal magnesium wasting.

Click HERE to Report test errors or omissions.
*If no email program is associated with this computer, please contact: for TestID: 701"