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Test ID CITRA Citrate Excretion, Random, Urine

Ordering Guidance

A timed 24-hour collection is the preferred specimen for measuring and interpreting this urinary analyte. Order CITR / Citrate Excretion, 24 Hour, Urine.

Random collections normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24-hour specimen, typically small children.

Specimen Required

Patient Preparation: 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.

Supplies: Sarstedt 5 mL Aliquot Tube (T914)

Container/Tube: Plastic, 5-mL tube

Specimen Volume: 4 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.


If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.

Useful For

Diagnosing risk factors for patients with calcium kidney stones using random urine specimens


Monitoring results of therapy in patients with calcium stones or renal tubular acidosis

Profile Information

Test ID Reporting Name Available Separately Always Performed
CITR2 Citrate Concentration, Random, U No Yes
CRETR Creatinine, Random, U No Yes
RAT10 Citrate/Creatinine Ratio No Yes

Method Name


Reporting Name

Citrate Excretion, Random, U

Specimen Type


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 14 days
  Frozen  14 days

Reference Values

No established reference values.

Day(s) Performed

Monday through Saturday

Report Available

Same day/1 to 3 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information



LOINC Code Information

Test ID Test Order Name Order LOINC Value
CITRA Citrate Excretion, Random, U 13722-4


Result ID Test Result Name Result LOINC Value
CRETR Creatinine, Random, U 2161-8
CITR2 Citrate Concentration, Random, U 2128-7
RAT10 Citrate/Creatinine Ratio 13722-4