Test ID: ZG748
Component(s): Z4413 Citric Acid, Random Urine LOINC: 2128-7, Z4414 Creatinine,Ur LOINC: 2161-8, Z4415 Citric/Creat Ratio LOINC: 13722-4
CPT code: 82507, 82570
LOINC:
Specimen Type: Random Urine
Frequency: 3 – 7 days
Instructions: 2 mL Urine from Random urine transport tube or Monovette with pH stabilizer, Refrigerated, pH 1-3 or frz. Min 1 mL.
Text: 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.
Methodology: Nuclear magnetic resonance (NMR)