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Test Code NBLD0164 Calcium, 24 Hour Urine

Useful For

Diagnosis of absorptive hypercalciuria and hypercalciuria caused by hyperparathyroidism, Paget’s disease, or “renal leak” type of calciuria as seen in renal tubular acidosis


o-Cresolphthalein-Complexone/Bichromatic End point

Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Urine
Container/Tube: 24-hour urine collection container
Specimen Volume:

Preferred: 10 mL

Acceptable: Entire collection
Specimen Minimum Volume: 1 mL
Collection Instructions:
1. Collect a 24-hour urine specimen.

2. No preservative required. 

3. Refrigerate specimen during collection.

4. Mix well before taking aliquot.

Additional Information:

1. Starting and ending times of collection are required.

2. Follow special collection instructions below

Special Instructions

Specimen Transport Temperature


Specimen Stability


Specimen Type Temperature Time
24-hour urine collection Refrigerated

3 days


Reference Values

42.0-353.0 mg/24 hour

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


81050-Urine timed measurement (if appropriate)