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RENAL STONE PROFILE, URINE ONLY

Mnemonic

STONE 2

Synonym

Urine Stone Profile

Includes

Timed Urines: Urine Calcium, Urine Uric Acid, Urine Magnesium, Urine Creatinine, Urine Urea Nitrogen, Urine Sodium, Urine Oxalate, Urine Citrate, Urine Calcium/Creatinine excretion ratio

Specimen Collection Requirements

Patient Preparation

Patient should avoid ingestion of vitamin C prior to collection (Oxalate).

Collect

Timed Urine, one 12 or 24 hour collection in a sterile container

Patient Instructions for Collecting a Timed Urine Sample (24, 48, 72 hours)

Handling

Refrigerate urine specimen during collection. To properly aliquot sample: 1) Thoroughly mix entire urine collection in one container; 2) Remove 20.0-30.0 mL aliquot. Record total volume of 12 or 24 hour urine and urine collection time interval.

Preferred Volume

20.0 mL

Minimum Volume

3.0 mL

Transport

Refrigerated (2-8°C)

Rejection Criteria

Specimens exposed to ambient temperature (20-25°C) for greater than 4 hours.

Stability

Urine (unpreserved): Ambient (20-25°C): 4 hours; Refrigerated (2-8°C): 6 days; Frozen (at or below -20°C): 1 month

Testing Information

Performed

LEGACY: 7 days/week, Urine Oxalate (ARUP): Mon - Fri, Urine Citrate (ARUP): 7 days/week

Reported

LEGACY: 24 hours, ARUP: 1-4 days

Method

See specific test.

Referral Lab

Urine Oxalate (20482), Urine Citrate (20852)

Reference Values

Reference Values

See specific tests.

Comments

Legacy Referral Department will adjust the pH to 1.5-2 with 6M HCl for ARUP Labs (Urine Oxalate and Urine Citrate). Send urine refrigerated.

CPT Codes

U Calcium: 82340, U Citric Acid: 82507, U Creatinine: 82570, U Magnesium: 83735, U Oxalate: 83945, U Sodium: 84300, U Urea: 84540, U Uric Acid: 84560

Last Updated: Thursday, January 5, 2017 03:41:47 AM


Client Services: 503-413-1234