Citric Acid, Serum

Test Code

CTAC

Quest Code

37233

CPT Codes
82507

Preferred Specimen

2 mL serum

Minimum Volume

1 mL

Other Acceptable Specimens

Plasma collected in: EDTA (lavender-top) tube, sodium heparin (green-top) tube, or PPT potassium EDTA (white-top) tube

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: 8 hours
Refrigerated: 17 days
Frozen: 17 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Received room temperature

Methodology
Enzymatic • Spectrophotometry (SP)

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule

A.M. Sets up 1 day a week.

Report Available

Reports in 2 to 9 days.

Reference Range

1.7-3.7 mg/dL

Clinical Significance

Citrate binds to calcium and inhibits kidney stone formation. Thus, low concentrations of citrate may lead to kidney stone formation. This is the most important risk factor for kidney stone formation in children. The treatment of calcium stones involves increasing urinary citrate excretion.

Performing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92675-2042

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.