Citric Acid, 24-Hour Urine with Creatinine

Test Code
CACU(4616)

Quest Code
4616

CPT Codes
82507, 82570

Includes
CPT code 81050 may be added at an additional charge for volume measurement

Preferred Specimen
10 mL 24-hour urine collected in a 24 hour urine container

Minimum Volume
1.5 mL

Instructions
Do not include first morning specimen; collect all subsequent voidings. The last sample collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding. Specify 24-hour total volume on container and test requisition.

Transport Temperature
Refrigerated (cold packs)

Specimen Stability
Room temperature: 8 hours
Refrigerated: 30 days
Frozen: 60 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received room temperature • Acidified urine

Methodology
Spectrophotometry (SP)

Setup Schedule
Tue, Thu, Sat

Report Available
1 to 4 Day(s)

Reference Range
See Laboratory Report


Clinical Significance
The mean urinary citrate excretion rate in patients with idiopathic calcium urolithiasis is significantly lower than that of control groups. Hypocitraturia is common in patients with urolithiasis resulting from renal tubular acidosis and in patients with enteric hyperoxaluria. Cirtate excretion is low in renal insufficiency.

Performing Laboratory
Quest Diagnostics Nichols Institute
27027 Tourney Road
Valencia, CA 91355-5386



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.