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CITRIC ACID(CITRATE), RANDOM U
Message"A timed 24-hour urine collection is the preferred specimen for measuring and interpreting this urinary analyte. Random collections normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24-hour specimen, typically small children. The mean urinary citrate excretion rate in patients with idiopathic calcium urolithiasis has been found to be significantly lower than that of control groups. Hypocitraturia is common in patients with urolithiasis resulting from renal tubular acidosis and in patients with enteric hyperoxaluria. Citrate excretion is low in renal insufficiency.
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Test Code
123866
CPT Codes
82507
Preferred Specimen
"Urine (random), acidified or frozen
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Minimum Volume
2.5 ml
Instructions
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pH must be 1-3 or the sample frozen without the addition of acid.
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pH must be 1-3 or the sample frozen without the addition of acid.
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Transport Container
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Use random urine transport tube or Monovette® with pH stabilizer (LabCorp N° 56015). Monovette® instructions accompany units.
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Use random urine transport tube or Monovette® with pH stabilizer (LabCorp N° 56015). Monovette® instructions accompany units.
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Transport Temperature
refrigerate or freeze
Specimen Stability
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Room temperature
14 days
Refrigerated
14 days
Frozen
14 days
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Room temperature
14 days
Refrigerated
14 days
Frozen
14 days
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Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
"Unpreserved specimen not frozen; acetic or boric acid used as a preservative
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Methodology
"Spectrophotometry (kinetic at 340 nm) "
