Test Code UMG24 Magnesium, Urine, Timed
Additional Codes
St. Luke's Compendium Code (Iatric): L650.1925
Performing Laboratory
St. Lukes Hospital Laboratory
Methodology
Methylthymol Blue (MTB)
Specimen Requirements
10 mL from a well-mixed, 24-hour urine collection. 25mL of 6N
Hydrochloric Acid should be used as a preservative.
Refrigerate specimen during collection, and send specimen
refrigerated.
Note: 1. 24-Hour volume and
starting and ending times are required on request
form for processing.
2. Follow instructions in “Urine Collection” in
“Special Instructions.”
Reference Values
24-255 mg/24 hr
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
83735