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Labcorp Oklahoma, Inc.
Test Directory


Magnesium, Urine 24hr

Order Name MAG URINE
Test Number: 2927020
Revision Date 05/23/2023
Test Name Methodology LOINC Code
Magnesium Urine
Atomic Absorption Spectrophotometry 19124-7 
Magnesium, Urine 24hr
Calculation 19124-7 
Total Volume - Prompt [3809175]
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 4 mL (0.5 mL) Urine, 24-hour 24 hour Urine Container Refrigerated
Instructions Notes: 2.2 mL (Note: This volume Does NOT allow for repeat testing.)
Specimen Type: Plastic urine container with 30 mL 6N HCl
Specimen Storage: Room Temperature (KBS tablet is acceptable).
Specimen Collection: Instruct the patient to void at 8 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM the next morning). Screw the lid on securely. Transport the specimen promptly to the laboratory. Container MUST be labeled with patient's full name, room number, date and time collection started, and date and time collection finished.
Special Instructions: Request form MUST state 24-hour specimen volume. After collection, pH is adjusted to 1.5 - 2.0 with 6N HCl.
Specimen Stability: Ambient: 14 days, Refrigerated : 14 days, Frozen: 14 days
Expected TAT 1 - 3 days  
CPT Code(s) 83735
Lab Section Reference Lab