Magnesium, 24-Hour Urine with Creatinine

Test Code

MG24UC

Alias/See Also

625

CPT Codes
82570, 83735

Includes

CPT code 81050 may be added at an additional charge for volume measurement

Preferred Specimen

10 mL 24-hour urine collected in 24-hour urine container

Minimum Volume

1 mL

Other Acceptable Specimens

10 mL concentrated Glacial acetic acid • 10 g boric acid
Acceptable to add preservative after collection

Instructions

Please submit a 10 mL aliquot of a 24-hour collection. Collect urine with 25 mL of 6N HCl to maintain a pH below 3. Refrigerate during and after collection. Do not include first morning specimen; collect all subsequent voidings. The last sample collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding. Record 24-hour urine volume on test request form and urine vial.

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 4 days
Refrigerated: 7 days
Frozen: 90 days

Methodology
Spectrophotometry (SP)

Setup Schedule

P.M. Sets up 5 days a week.

Report Available

Reports in 2 to 5 days.

Reference Range

Magnesium, 24-Hour Urine

Male	28-180 mg/24 h
Female	18-130 mg/24 h

Magnesium, 24-Hour Urine

Male	16-90 mg/g creat
Female	30-135 mg/g creat

Creatinine, 24-Hour Urine

<3 Years	Not established
3-8 Years	0.10-0.80 g/24 h
9-12 Years	0.20-1.40 g/24 h
13-17 Years	0.40-1.90 g/24 h
>17 Years	0.50-2.15 g/24 h

Performing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92675-2042

Last Updated: May 25, 2023

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.