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Magnesium, Urine 24 Hour

Mnemonic:    [U24 Mg]
Name:    Magnesium, Urine 24 Hour
Specimen:    1 mL aliquot from a 24 hour urine collection. Refrigerate during collection.
Spec Stability:    Stable 5 days refrigerated.
Reference Range:    0.05 - 0.16 G/24 hr
  Method:    Colorimetric @ 630 with Formazan Dye
Note:    This test does not require a preservative during collection. Once the specimen is received in the lab an aliquot should be adjusted to pH 3.0 - 4.0, then centrifuged.

Collection instructions for a 24 hour urine sample