Citric acid, random urine-994

Test info

Citric acid, random urine
Citrate, random urine
Citrate excretion, random urine

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.


Urine, random
10 mL
2.5 mL

Transfer sample to a  Urine Monovette with pH stabilizer


If a Urine Monovette with pH stabilizer is unavailable, transfer the specimen to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp) and freeze


Specimen preserved in Urine Monovette with pH stabilizer

Refrigerated (preferred) - 14 days

Ambient - 14 days

Frozen - 14 days

Freeze/thaw cycles - Stable x3

Unpreserved specimen

Frozen (strict) - 14 days

1 week
  • If specimen is not Frozen; pH must be between 1-3


LabCorp Burlington (123866): R-NX
Mo - Fr
2 - 5 days

Spectrophotometry (kinetic at 340 nm)

Clinical and Interpretive info

Gender Age (years) Range (mg/L)
Male <40 9 - 864
  ≥40 7 - 1130
Female <40 40 -1930
  ≥40 10 -1560