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Test Code Stone Ur Kidney Stone Analysis

Reporting Name

Kidney Stone Analysis

Useful For

Managing patients with recurrent renal calculi

Shipping Instructions

1. Transport specimen per Kidney Stone Packaging Instructions in Special Instructions.

2. Specimen must be sent clean and dry.

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. Prepare specimen per Patient Collection Instructions for Kidney Stones in 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.

Specimen Type


Specimen Minimum Volume

Entire stone

Specimen Stability Information

Specimen Type Temperature Time
Stone Ambient (preferred)
  Frozen  365 days
  Refrigerated  365 days
Seattle Children's Hospital Note:

Stable > 4 months room temp

Day(s) and Time(s) Performed

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

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

Seattle Children's Hospital Note:

TAT: 4 - 6 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Method Name

Infrared Spectrum Analysis

Method Description

Representative specimens are taken from all identifiable layers of the calculus. Each specimen is crushed into a fine powder. An infrared spectrum of each specimen is recorded and the resulting spectrum compared against reference spectra of all known calculus components. This procedure allows for accurate analyses of complex crystal mixtures as well as the hydration state of each crystal type.(Hesse A, Bach D: Stone analysis by infrared spectroscopy. In Urinary Stones: Critical and Laboratory Aspects. Edited by GA Rose. Baltimore, MD, University Park Press, 1982)

Reference Values

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

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


LOINC Code Information

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


Result ID Test Result Name Result LOINC Value
8596 Kidney Stone Analysis 40787-4
SRC1 Source: 31208-2
2440 1st Constituent: 9795-6
2441 2nd Constituent: 9795-6
2442 3rd Constituent: 9795-6
2443 Nidus, Major 9795-6
2444 Nidus, Minor 9795-6
2445 Shell, Major 9795-6
2446 Shell, Minor 9795-6
2447 Comment 48767-8

Reject Due To








Source other than renal (kidney, bladder, ureter, urethra, or prostate)



If not ordering electronically, complete, print, and send a General Request (T239) with the specimen.