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Test ID CASA Kidney Stone Analysis

Useful For

Managing patients with recurrent renal calculi

Method Name

Infrared Spectrum Analysis

Reporting Name

Kidney Stone Analysis

Specimen Type

Stone

Sources: Bladder, kidney, prostatic, renal, or urinary

Container/Tube: Stone Analysis Collection Kit (Supply T550)

Specimen Volume: Entire dried calculi specimen

Collection Instructions:

1. Prepare specimen per Kidney Stone Analysis Patient Collection Instructions in Special Instructions.

2. Transport specimen per Kidney Stone Analysis Packaging Instructions in Special Instructions.

Additional Information:

1. Specimen source is required.

2. Specimen must be sent clean and dry.

3. Do not place stone directly in a bag. If specimen is received in a bag, either transfer stone into a screw-capped, plastic container or place bag containing stone in a screw-capped, plastic container.

Forms: If not ordering electronically, complete, print, and send a General Request Form (T239) with the specimen (http://www.mayomedicallaboratories.com/media/customer-service/forms/general-request-form.pdf).

Specimen Minimum Volume

Entire stone

Specimen Stability Information

Specimen Type Temperature Time
Stone Ambient (preferred)
  Frozen 
  Refrigerated 

Clinical Information

The composition of urinary stones may vary from a simple crystal to a complex mixture containing several different species of crystals. The composition of the nidus (center) may be entirely different from that of the peripheral layers.

 

Eighty percent of patients with kidney stones have a history of recurrent stone formation. Knowledge of stone composition is necessary to guide therapy of patients with recurrent stone formation.

 

Treatment of urinary calculi is complex.(1) In an overly simplified format, the following patterns are often treated as follows:

-Hyperuricuria and predominately uric acid stones: alkalinize urine to increase uric acid solubility.

-Hypercalciuria and predominately hydroxyapatite stones: acidify urine to increase calcium solubility. However, treatment also depends on urine pH and urine phosphate, sulfate, oxalate, and citrate concentrations.

-Hyperoxaluria and calcium oxalate stones: increase daily fluid intake and consider reduction of daily calcium. However, daily requirements for calcium to maintain good bone formation complicate the treatment.

-Magnesium ammonium phosphate stones (struvite): Investigate and treat urinary tract infection.

 

See Kidney Stones and Stone Analysis in Publications.

Reference Values

Quantitative report

Cautions

No significant cautionary statements

Day(s) Performed

Monday through Friday; 8 a.m.-8 p.m.; Saturday; 8 a.m.–3 p.m./Continuously

Report Available

2 days

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

82365

NY State Approved

Yes