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CYSTINE QUANTITATIVE, URINE

Mnemonic

QNT CYS U

Guidelines

This test is indicated only to monitor patients with cystinuria on therapy.

Specimen Collection Requirements

Collect

Urine, 24-hour collection, other timed urine collections are also acceptable, refrigerate specimen during collection

Handling

CRITICAL FROZEN. As soon as possible after urine has been obtained, mix the collection well and freeze. Avoid dilute urine when possible. Clinical information is needed for appropriate interpretation. Additional required information includes age, gender, diet (e.g., TPN therapy), drug therapy and family history. See the Biochemical Genetics Patient History Form. Record total volume and collection time interval on the specimen and test request form.

Preferred Volume

10.0 mL

Minimum Volume

3.0 mL

Transport

Frozen

Rejection Criteria

Refrigerated and ambient samples

Stability

Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month

Testing Information

Performed

Mon - Fri

Reported

3-7 days

Method

Liquid chromatography/tandem mass spectrometry

Referral Lab

ARUP (81106)

Reference Values

Reference Values

Interpretation provided.

CPT Codes

82131

Last Updated: Thursday, March 14, 2019 12:50:35 PM


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