Lab Test

Citrate Excretion, Random, Urine

Test Codes

Mayo: CITRA, Epic: LAB7132, Beaker:


Any drug that causes alkalemia or acidemia may be expected to alter citrate excretion and should be avoided, if possible. The patient must avoid laxative use for 24 hours prior to collection.

Specimen Collection Criteria

Collect: Random urine in a screw-capped container (preferred) or other sterile collection container. (Minimum: 1.0 mL)

Physician Office/Draw Specimen Preparation

Maintain specimen refrigerated (2-8°C or 36-46°F) prior to transport.

Preparation for Courier Transport

Transport: Random urine, refrigerated (2-8°C or 36-46°F). (Minimum: 1.0 mL)

Rejection Criteria

Specimens not collected and processed as indicated.

In-Lab Processing

Maintain specimen refrigerated (2-8°C or 36-46°F) prior to transport.

Transport: 4.0 mL random urine, refrigerated (2-8°C or 36-46°F). (Minimum: 1.0 mL)


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): 14 days
Frozen (-20°C/-4°F or below): 14 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.


Sent to Mayo Medical Laboratories, Rochester, MN.


Monday – Saturday.
Results available within 2-5 days.

Reference Range

By report.

Test Methodology



A low value represents a potential risk for kidney stone formation/growth. Patients with low urinary citrate, and new or growing stone formation may benefit from adjustments in therapy known to increase urinary citrate excretion.
Very low levels suggest investigation for the possible diagnosis of metabolic acidosis (eg, renal tubular acidosis).
For children ages 5 to 18, a ratio of <0.176 mg citrate/ mg creatinine is below the 5% reference range and considered low.

CPT Codes

82507, 82570.


Last Updated


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