cystine stone

Etiology

cystinuria

Epidemiology

• tends to occur at a younger age than calcium stones

Laboratory

• cystine in urine
• urine microscopy hexagonal crystals in urine

Management

• hydration
• alkalinization of urine to pH > 6.5
  • potassium citrate
  • potassium bicarbonate
• penicillamine
• tiopronin (alpha-mercaptopropionyl glycine)
• captopril may have benefits similar to penicillamine

More general terms

• urinary calculus (stone, nephrolithiasis, urolithiasis)

Additional terms

• cystinuria