Cystine, Quantitative, Urine

CPT: 82131
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Test Details


Measures levels of cystine in urine to detect presence of cystinuria and nephrolithiasis.


Liquid chromatography/tandem mass spectrometry (LC/MS-MS)

Reference Interval

10.00−100.00 mg/24 hours

Specimen Requirements


Urine (24-hour)


5 mL aliquot

Minimum Volume

2.5 mL aliquot


Plastic urine container without preservative.

Storage Instructions

Maintain specimen at room temperature. Stable frozen for one year, room temperature for seven days, or refrigerated for three months.

Clinical Information

Special Instructions

The test request form must state date and time collection started and finished. The test request form must state whether patient is taking penicillamine. Measure and record the total 24-hour urine volume on the test request form.


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
700195 Cystine, Quant. 24 hr Urine 700381 Cystine, Quantitative, Urine mg/L 32169-5
700195 Cystine, Quant. 24 hr Urine 700382 Cystine, Quant, Ur mg/24 hr 2179-0

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