Citric Acid, Urine 24 Hour
Citric Acid, Urine, Urine Citrate
Antrim #13205, EPIC: LAB5853, SOFT: CIT24
Please refer to the Specimen Collection Manual for instructions on 24 Hour Urine Collection:
Specimen Collection Criteria
Collect (preferred specimen): 24 hour urine sample with no preservatives.
- Keep 24 hour urine specimen iced or refrigerated during collection.
- Include start and end dates and times for the collection period on the specimen container.
Urine Preservative Options
6N Hydrochloric Acid
Boric Acid (10g)
50% Acetic Acid
Physician Office/Draw Specimen Preparation
Maintain specimens refrigerated (2-8°C or 36-46°F) prior to transport.
Preparation for Courier Transport
Transport: Entire 24 hour urine collection, refrigerated (2-8°C or 36-46°F).
- Random urine specimens.
- Samples not kept refrigerated (2-8°C or 36-46°F).
- Samples not collected and processed as indicated.
Measure total volume of 24 hour urine specimen. Record total volume and collection start and end dates and times in the LIS system. Aliquot a minimum of 10 mL from the well-mixed 24 hour urine collection and centrifuge. Refrigerate aliquot prior to analysis.
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:
Refrigerated (2-8°C or 36-46°F): 7 days
Royal Oak Special Testing Laboratory
Varies, once per week.
Results available within 7 days.
320-1240 mg/24 hr.
UV-Method 340 nm.
Decreased levels of urinary citrate (hypocitraturia) are associated with increased risk of renal stone formation.
This assay aids in determining the risk of formation of renal calcium stones. It is also used to monitor the results of therapy in patients with calcium stones or renal tubular acidosis. It is determined as part of the Stone Former Panel.
LOINC: 6687-8, 21203-5
Special Chemistry Laboratory – RO
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