Colorimetric (Xylidyl Blue)
To aid in assessing cellular magnesium loss
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.
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.