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Calcium, Urine 24 Hour

Mnemonic:    [U24 Ca]
Name:    Calcium, Urine 24 Hour
Specimen:    1 mL aliquot from a 24 hour urine collection. Refrigerate during collection.
Spec Stability:    Stable 5 days refrigerated.
Reference Range:    Calcium Free Diet 5 - 40 mg/24Hr
 Low to Average Diet 50 - 150 mg/24 Hr
 Average Diet (800 mg/day) 100 - 300 mg/24Hr
 Average Diet (>800 mg/day) 420 - 560 mg/24Hr
  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.

Collection instructions for a 24 hour urine sample