MAGNESIUM, URINE, 24 HOUR

Test Code

UMG (OE), UMG24 (LAB)

CPT Codes
83735

Preferred Specimen

Metal-free container without preservative

Patient Preparation
Discard first morning urine on day of collection and note the time. Collect all urine voided during the next 24 hours. Refrigerate the urine during entire collection. See 24 hour collection instructions link below.

Minimum Volume

10 mL aliquot (20 mL aliquot optimal)

Instructions

Mix the specimen well and measure the 24 hour volume
RECORD THE TOTATL VOLUME
Pour off 20 mL of urine into a separate plastic screw-cap container
Refrigerate if not tested immediately
Sample will be acidified with concentrated HCL to a pH of 1 prior to testing

Transport Temperature

Refrigerate

Specimen Stability

2-8°C up to 7 days

Methodology
Photometric

Setup Schedule

M, T, W, Th, F, Sa, Su

As received; STAT testing is available

Reference Range

24 - 255 mg/24 Hours

Clinical Significance

Urinary magnesium concentrations often decline before serum concentrations, such as in cardiac arrhythmias.

Performing Laboratory
Alverno Central Lab

Additional Information
24 Hour Urine Collection Instructions

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.