CALCIUM, URINE, 24 HOUR

Test Code

CAUN

CPT Codes
82340

Preferred Specimen

24 Hour Urine Container without preservative
(aliquot or transfer urine into a transfer tube and note the total volume)

Minimum Volume

5 mL

Instructions

Mix the specimen well and measure the 24-Hour volume
RECORD THE TOTAL VOLUME
Pour off 20 mL of urine into a separate plastic screw-cap container
Refrigerate if not tested immediately
Sample will be acidified to a pH <2 with 6N HCL. Samples with urine pH below 1.5 may result in a negative bias.

Transport Temperature

Refrigerate

Specimen Stability

2-8°C up to 7 days

Methodology

Arsenazo III

Setup Schedule

M, T, W, Th, F, Sa, Sun

Report Available

Same day tested at the performing laboratory.

Reference Range

100-300 mg/day

Clinical Significance

Differentiates between hypercalciuria and hypocalciuria and aids in the differential diagnosis of nephrolithiasis.

Performed By
Alverno Laboratories

Performing Laboratory
Alverno Central Lab
NCHB1 (Chemistry, Beckman AU)

Additional Information
24 Hour Urine Collection

Last Updated: July 5, 2023

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.