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RENAL STONE PROFILE, BLOOD AND URINE

Mnemonic

STONE 1

Synonym

Stone Profile - Stone Profile, Renal

Includes

Serum or Plasma: Glucose, Calcium, Phosphorus, BUN, Sodium, Potassium, Creatinine, Chloride, Albumin, Uric Acid, Cholesterol, Total CO2

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

Specimen Collection Requirements

Patient Preparation

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

Collect

Serum or Plasma, one 5.0 mL gold (SST), 7.0 mL red, or 3.0 mL mint green (PST) top tube. 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

Both urine and serum or plasma are required.

Serum or Plasma: Allow serum to clot completely at room temperature (minimum: SST - 30 minutes and red top tubes – 60 minutes). Preferably, separate serum or plasma from cells before transport. 

Timed Urine: 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 on container and test request form.

Preferred Volume

Serum or Plasma: 1.0 mL, Urine: 20.0 mL 

Minimum Volume

Serum or Plasma: 0.5 mL (Whole Blood 1.2 mL minimum draw), Urine: 3.0 mL

Transport

Refrigerated (2-8°C)

Rejection Criteria

Grossly hemolyzed specimens, urine specimens exposed to ambient temperature (20-25°C) for greater than 4 hours

Stability

Serum or Plasma: Lithium heparin tubes (PST) are stable up to 3 days refrigerated on the primary spun gel tube. AFTER SEPARATION FROM CELLS: Ambient (20-25°C): 24 hours; Refrigerated (2-8°C): 3 days; Frozen (at or below -20°C): 1 month
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

ARUP: Urine Oxalate (20482), Urine Citrate (20852)

Reference Values

Reference Values

Interpretive guidelines provided with the report.

Comments

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

CPT Codes

Creatinine Clearance: 82575, U Calcium: 82340, U Citric Acid: 82507, U Creatinine: 82570, U Magnesium: 83735, U Oxalate: 83945, U Sodium: 84300, U Urea: 84540, U Uric Acic: 84560, Renal Function: 80069

Last Updated: Tuesday, July 24, 2018 12:01:29 PM


Client Services: 503-413-1234