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Test Code STONE Kidney Stone Analysis

Important Note

Mayo code KIDST


Shipping Instructions


 



Necessary Information


Specimen source is required.



Specimen Required


Supplies: Stone Analysis Collection Kit (T550)

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

Specimen Volume: Entire dried calculi specimen

Collection Instructions:

1. Have patient collect specimen using the Patient Collection Instructions for Kidney Stones (see Special Instructions).

2. Prepare specimen per Guiding Proper Stone Collection information (see Special Instructions).

2. 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 1 of the following forms with the specimen:

-General Request (T239)

-Renal Diagnostics Test Request (T830)

Useful For

Managing patients with recurrent renal calculi

Testing Algorithm

Upon arrival in the performing laboratory, all stone specimens and the containers they are received in will be inspected. Prior to analysis, stones must be clean and dry. If the stone, or its container, has any amount of moisture, blood, or foreign material present, the laboratory will add the STNPC and perform cleaning and drying of the specimen at an additional charge.

Method Name

Infrared Spectrum Analysis

Reporting Name

Kidney Stone Analysis

Specimen Type

Stone

Specimen Minimum Volume

Entire stone

Specimen Stability Information

Specimen Type Temperature Time Special Container
Stone Ambient (preferred)
  Frozen  365 days
  Refrigerated  365 days

Reject Due To

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

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 can be useful 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.

Reference Values

The presence of a kidney stone is abnormal. A quantitative report will be provided after analysis.

Day(s) and Time(s) Performed

Monday through Friday; 8 a.m.-8 p.m.

Saturday; 8 a.m.-3 p.m.; Continuously

Analytic Time

2 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared, approved or is exempt by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

82365

LOINC Code Information

Test ID Test Order Name Order LOINC Value
KIDST Kidney Stone Analysis 74446-6

 

Result ID Test Result Name Result LOINC Value
605761 Kidney Stone Analysis 40787-4
SRC1 Source: 31208-2
605762 Interpretation 9795-6

NY State Approved

Yes

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
STNPC Stone Processing Charge No, (Result Bill) No
Northwell Health Laboratories Additional Information:

Computer Interface Code

    PDM #  5900057