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Magnesium Urine Test, 24-Hour

The Magnesium Urine Test measures the amount of magnesium (an electrolyte) in urine collected over 24 hours.  This test is used to evaluate and manage electrolyte problems in the body.

Sample Report

Test Code: 003400

CPT Code: 83735

Also Known As: Mg; Mag

Methodology:

Atomic absorption spectrometry (AAS) or colorimetric

Specimen Type: Urine

Preparation:

You must take your lab order to the lab to obtain a proper specimen container before collection. Urinate at 8am and discard the specimen. Then collect all urine in 24-hour period, ending with final collection at 8am the next morning. Refrigerate the collected urine between all voidings or keep it in a cool place. Screw the lid on securely. Transport the specimen promptly to the laboratory. Container must be labeled with full name, date and time collection started, and date and time collection finished.

Test Results:

2-3 days. May take longer based on weather, holiday or lab delays.


Test Code: 11322

CPT Code: 83735

Also Known As: Mg; Mag

Methodology:

Spectrophotometry (SP)

Specimen Type: Urine

Preparation:

You must take your lab order to the lab to obtain a proper specimen container before collection. Urinate at 8am and discard the specimen. Then collect all urine in 24-hour period, ending with final collection at 8am the next morning. Refrigerate the collected urine between all voidings or keep it in a cool place. Screw the lid on securely. Transport the specimen promptly to the laboratory. Container must be labeled with full name, date and time collection started, and date and time collection finished.

Test Results:

2-3 days. May take longer based on weather, holiday or lab delays.

Description

A magnesium test is used to measure the level of magnesium in the urine.  Abnormal levels of magnesium are most frequently seen in conditions or diseases that cause impaired or excessive excretion of magnesium by the kidneys or that cause impaired absorption in the intestines. Magnesium levels may be checked as part of an evaluation of the severity of kidney problems and/or of uncontrolled diabetes and may help in the diagnosis of gastrointestinal disorders.

Magnesium levels may be measured frequently to monitor the response to oral or intravenous (IV) magnesium supplements and may be ordered, along with calcium and phosphorus testing, to monitor calcium supplementation.

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