Magnesium, 24-Hour Urine without Creatinine : 11322

Test Code
24MGQ or 11322

CPT Codes
83735

Instructions
24-hour urine 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.

Transport Container
Submit a 10 mL (Minimum 1 mL) aliquot of a 24-hour collection.  Record 24-hour urine volume on test request form and urine vial.

Transport Temperature
Refrigerated.

Specimen Stability
Room temperature: 4 days; Refrigerated: 7 days; Frozen: 90 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Random urine.

Methodology
Spectrophotometry

Setup Schedule
Tuesday - Saturday

Report Available
2-5 days (From receipt at performing laboratory)

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

Clinical Significance
Useful in the assessment of nutritional and metabolic disorder. Increased levels indicate renal and respiratory failure and decreased levels indicate seizures, tetany, cardiac arrhythmias, Low CA++ and K+.

Performing Laboratory
Quest Diagnostics



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.