Test ID: ZG096
Component(s): Z0350 Citric Acid, Urine LOINC: 21203-5, Z0347 Citric Acid, U, 24hr LOINC: 6687-8
CPT code: 82507
LOINC:
Specimen Type: Plastic 24hr urine container with 30 mL 6N HCl preservative
Frequency: 2 – 5 days shifts.
Instructions: 2 mL Urine from Plastic 24hr urine container with 30 mL 6N HCl preservative, Refrigerated, pH must be 1-3 or Freeze. Min 1 mL aliquot.
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)