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Test ID KIDST Kidney Stone Analysis

Shipping Instructions

Transport specimen per Kidney Stone Packaging Instructions in Special 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. Clean any blood or foreign material from the stone with water.

2. Send entire stone. Stone should be air dried thoroughly at room temperature for 24 hours on a tissue or towel and sent in screw-capped, plastic container.

3. Indicate source of specimen on outside of container (eg, left kidney, bladder, right ureter).

4. If multiple stones are collected and individual testing is desired for each stone, place each stone into its own container. Testing must be ordered separately on each stone. Each order will be charged separately.

5. Important: Any specimen received with residual moisture on the stone or in the container will result in a testing delay. STNPC will be performed and billed as appropriate.

-A dry stone will not stick to the walls of the container.

-Do not send stone in formalin, surgical gel, or any other liquid as it interferes with the analytical procedure.

-Do not tape specimen to anything. Tape interferes with the analytical procedure.

-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.

-Do not send filter.


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

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


Specimen Minimum Volume

Entire stone

Specimen Stability Information

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

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

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test uses a standard method. Its performance characteristics were 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
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

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
STNPC Stone Processing Charge No, (Result Bill) No