Cystine, Urine (24 Hr)

Useful For:
Cystinuria is an autosomal recessive disease in which dibasic amino acids, including cystine, are excreted in excess. Cystine kidney stones account for approximately 1-3% of all kidney stones. Age of onset is often younger than other types of kidney stones and the recurrence is approximately one-third.

Methodology: Liquid Chromatography Mass Spectrometry

Specimen Requirements:
Submit an entire 24-hour urine collection in a urine container supplied by Meadville Medical Center Laboratory. No preservative is needed. Refrigerate specimen during and after collection. See “Urine Collection” for 24-hour specimens in “Specimen Collection and Preparation” section in the front section of this manual. FREEZE aliquot after collection

NOTE:
Refer to “Patient Information” section in back of manual for patient handout explaining collection information for this test.
Patient age is required for correct interpretation.
IVP within 48 hours of collection unacceptable.

Analytical Time: 5 days

Days Set Up: 2 days a week

CPT Information:
82131 – cystine