Test Overview
Test Methodology

Compound Enzyme Assay

Test Usage

Diagnosis of renal tubule acidosis and some forms of calcium-dependent kidney stones.

Reference Range *

Normal adult: greater than 200 mg/24 hrs (> 1058 uMol/24 hrs)

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Varies; test performed every other week, on Friday.
Analytic Time

8 hours

Soft Order Code
UCITR
MiChart Code
Citrate, 24 HR Urine
Synonyms
  • Citric Acid
  • CITRATE URINE 24 HOUR
  • CITRATE
Laboratory
Chemical Pathology
Section
Special Chemistry
Specimen Requirements
Collection Instructions

Collect 24 hour urine specimen. Add 25 mL of 50% glacial acetic acid (15 mL for pediatric patients) to container prior to start of collection. Following collection, mix very well to dissolve any citrate crystals that may have formed, measure 24 hour urine volume, aliquot 20 mL into a plastic urine container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Specimens with no preservative are also acceptable: send entire 24 hour collection to MLabs.

Alternate Specimen
May be collected in plain (no preservative) container and acid added at the end of collection. It is preferred to have acid added as soon as possible at the client site, mixed very well, and an aliquot sent. It is very important to mix well with acid prior to aliquotting to dissolve any crystals that may have formed. If acid cannot be added at the client site, the entire collection must be sent. [rev 9/08]
Normal Volume
20 mL aliquot of 24 hour urine collection
Minimum Volume
5 mL aliquot of 24 hour urine collection
Billing
CPT Code
82507
Fee Code
20751
LOINC
6687-8
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