Magnesium, 24hr Urine

Test Overview

Test Methodology

Colorimetric (Xylidyl Blue)

Test Usage

To aid in assessing cellular magnesium loss

Reference Range*

50 - 200 mg/24 hrs (5-20 mMol/24 hrs). Random urine collections are reported in units of mg/dL, for which reference values are not established.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Test Performed

Daily

Analytic Time

8 hours

Soft Order Code

MAGQ

MiChart Code

Magnesium, 24 HR Urine

Laboratory

Chemical Pathology

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Specimen Requirements

Offsite Collection Instructions

Collect 24 hour urine in a clean, plastic container with no metal cap or glued insert and no preservative. Aliquot 5 mL urine into a clean, plastic container with no metal cap or glued insert and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Random urine also acceptable.

Rejection Criteria

Specimens collected with Boric Acid preservative are not acceptable.

Normal Volume

5 mL aliquot of 24 hour urine collection or 2 mL aliquot of random urine collection.

Minimum Volume

2 mL aliquot of 24 hour urine collection or 1 mL aliquot of random urine collection.