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Beaumont Laboratory

Magnesium, Urine

Urine Magnesium, 24 Hour Urine: EPIC: LAB6601, SOFT: MAG24, Random Urine: EPIC: LAB5088, SOFT: MAGU

Instructions

Note: 24 hour and random urine specimens MUST be collected separately. See below for collection criteria.

Specimen Collection Criteria

Collect: 24 hour urine or timed urine specimen with a 24 hour urine container with 15 mL of 6N Hydrochloric Acid added prior to the start of collection.
Also acceptable: Random urine specimen in a screw-capped container (preferred) or another sterile collection cup with no preservative. (Minimum: 30 mL) 

  • Refer to the table of Urine Preservative Options when multiple tests are requested.
  • Keep 24 hour urine specimen iced or refrigerated during collection.
  • Include start and end dates and times for the collection period on the specimen container.
Urine Preservative Options
No Preservative
6N Hydrochloric Acid
Boric Acid (10g)
Sodium Carbonate
50% Acetic Acid
Acceptable
Preferred
Acceptable
Unacceptable
Unacceptable

Physician Office/Drawsite Specimen Preparation

Maintain specimens refrigerated (2-8°C or 36-46°F) prior to transport.

Preparation for Courier Transport

Transport: Entire 24 hour urine collection, or random urine, refrigerated (2-8°C or 36-46°F).

Rejection Criteria

  • Specimens not collected and processed as indicated.

Storage

Specimen Stability for Testing:

Room temperature (20-26°C or 68-78.8°F): 4 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): For longer storage.

Specimen Storage in Department Prior to Disposal:

Refrigerated (2-8°C or 36-46°F): 7 days (Royal Oak and Troy store an aliquot for 30 days.)

Laboratory

Farmington Hills Chemistry Laboratory.
Royal Oak Automated Chemistry Laboratory.
Troy Chemistry Laboratory.

Performed

Sunday - Saturday.
Results available within 24 hours.

Reference Range

Urine Magnesium: 50-200 mg/24 hours.
Normal ranges for random urines or for collections other than 24 hours have not been established.

Test Methodology

Spectrophotometry.

Interpretation

  • Low urinary magnesium levels are associated with magnesium deficiency.
  • Increased levels may be due to alcohol consumption, diuretics, corticosteroids, cisplatin therapy, and Bartter's syndrome.

Clinical Utility

Magnesium measurements aid in the diagnosis and management of hypomagnesemia (abnormally low plasma levels of magnesium) and hypermagnesemia (abnormally high plasma levels of magnesium). Urine magnesium is measured as part of the Stone Former Panel and is useful in assessing the likelihood of stone formation.

CPT Code

83735.

Test Codes

24 Hour Urine: EPIC: LAB6601, SOFT: MAG24, Random Urine: EPIC: LAB5088, SOFT: MAGU

Last Updated

12/29/2017

Microtainer® and Vacutainer® are registered trademarks of Becton, Dickinson and Company.
UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.

This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.