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Calcium, Random Urine

Mnemonic:    [U Calcium]
Name:    Calcium, Random Urine
Specimen:    1 mL urine from a random collection.
Spec Stability:    Stable 5 days refrigerated.
  Method:    Colorimetric; Arsenazo III @ 680
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 1.5 - 5.0, then sit for an hour before centrifugation.