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General
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Clinical Use:
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Urinary citrate is a major inhibitor of kidney stone formation, partly due to calcium binding in urine. Low urine citrate levels are considered a risk factor for kidney stone formation. There are several metabolic disorders associated with low urinary citrate concentrations. Any condition which lowers renal tubular pH or intracellular pH, may decrease citrate, e.g. metabolic acidosis, increased acid ingestion, hypokalaemia or hypomagnesaemia. |
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Availability:
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Samples are batched and tested once a week.
This test can only be performed on patients >=13 years of age.
If a 24 hour citrate is received on a patient <13 years of age, please register as a spot urine sample (UCTCR). |
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Code:
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24CIT |
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Handling Instructions (to laboratory):
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Send sample chilled. |
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Hyperlink:
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Reference Interval:
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13 years to <120 years: 1.0-6.0 mmol/day
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Collection Requirements
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Container:
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UR24 Sulphamic Acid (UR24SULP), |
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Sample Type:
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See container |
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Minimum Collection Volume:
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Collection Instructions:
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PathWest collections should use Sulphamic Acid 24Hr collection bottles.
Note that for external collections, 25mL of 6 mol/L HCl or other suitable acidifying agent is acceptable.
To protect urine citrate from degradation, urine pH must be <3.6. |
Processing Requirements
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Alternate Containers:
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Processing Instructions:
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Minimum Assay Volume:
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5mL |
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Stability:
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Transport Instructions (to testing laboratory):
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Send sample chilled. |
Testing Locations
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Performed at:
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Section
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Department
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Site
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Contact Phone
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| Special Chemistry |
Biochemistry |
Fiona Stanley Hospital |
6152 2830 |
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Last Updated : 13-08-2025 13:16 |