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26168 Kidney Stone Analysis (KIDST)

Kidney Stone Analysis (KIDST)
Test Code: STONEM
Synonyms/Keywords

​Calculi Stone Analysis, Calculus (Stone) Analysis, Prostatic Stones, Renal  Calculi, Urinary Calculi

Useful For

​Managing patients with recurrent renal calculi

Specimen Requirements
Fasting RequiredSpecimen TypePreferred Container/TubeAcceptable Container/TubeSpecimen VolumeSpecimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
​No​Bladder, Kidney, Prostatic, Renal or Urinary Stone​Screw-capped, plastic container​Entire dried calculi specimen
Collection Processing Instructions

​Specimen source is required.

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 a 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 individal 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.

 -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.

Acceptable Specimen Types

​Stone from bladder, kidney, prostatic, renal or urinary

Specimen Stability Information
Specimen TypeTemperatureTime
​Stone ​ ​​Ambient (preferred)
​Frozen​365 days
​Refrigerated​365 days
Rejection Criteria

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

Performing Laboratory Information
Performing LocationDay(s) Test PerformedReport AvailableMethodology/Instrumentation
​Mayo Clinic Laboratories​Monday through Saturday​2 to 4 days​Infrared Spectrum Analysis
Reference Lab
Reference Range Information
The presence of a kidney stone is abnormal.  A quantitative report will be provided after analysis.
Interpretation

​The interpretation of stone analysis is complex, and beyond the scope of this text.  We refer you to chapter 25 of Smith LH:  Diseases of the Kidney. Vol 1. Fourth edition.  Edited by RW Schrier, CW Gottscholk.  Boston, MA, Little, Brown and Company, 1987.

Calcium oxalate stones:

-Production of calcium oxalate stones consisting of oxalate dihydrate indicate that the stone is newly formed and current urine constituents can be used to assess the importance of supersaturation.

-Producation of calcium oxalate stones consisting of oxalate monohydrate indicate an old (>2 months since formed) stone and current urine composition may not be meaningful.

 

Magnesium ammonium phosphate stones (struvite): 

-Production of magnesium ammonium phosphate stones (struvite) indicates that the cause of stone formation was infection.

-Treatment of the infection is the only way to inhibit further stone formation.

 

Ephedrine/guaifenesin stones:

-Certain herbal and over-the-counter preparations (eg, Mah Jung) contain high levels of ephedrine and guaifenesin.  Excessive consumption of these products can lead to formation of ephedrine/guaifenesin stones.

Outreach CPTs
CPTModifier
(if needed)
QuantityDescriptionComments
​82365
Synonyms/Keywords

​Calculi Stone Analysis, Calculus (Stone) Analysis, Prostatic Stones, Renal  Calculi, Urinary Calculi

Ordering Applications
Ordering ApplicationDescription
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting RequiredSpecimen TypePreferred Container/TubeAcceptable Container/TubeSpecimen VolumeSpecimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
​No​Bladder, Kidney, Prostatic, Renal or Urinary Stone​Screw-capped, plastic container​Entire dried calculi specimen
Collection Processing

​Specimen source is required.

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 a 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 individal 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.

 -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.

Acceptable Specimen Types

​Stone from bladder, kidney, prostatic, renal or urinary

Specimen Stability Information
Specimen TypeTemperatureTime
​Stone ​ ​​Ambient (preferred)
​Frozen​365 days
​Refrigerated​365 days
Rejection Criteria

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

Useful For

​Managing patients with recurrent renal calculi

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

​The interpretation of stone analysis is complex, and beyond the scope of this text.  We refer you to chapter 25 of Smith LH:  Diseases of the Kidney. Vol 1. Fourth edition.  Edited by RW Schrier, CW Gottscholk.  Boston, MA, Little, Brown and Company, 1987.

Calcium oxalate stones:

-Production of calcium oxalate stones consisting of oxalate dihydrate indicate that the stone is newly formed and current urine constituents can be used to assess the importance of supersaturation.

-Producation of calcium oxalate stones consisting of oxalate monohydrate indicate an old (>2 months since formed) stone and current urine composition may not be meaningful.

 

Magnesium ammonium phosphate stones (struvite): 

-Production of magnesium ammonium phosphate stones (struvite) indicates that the cause of stone formation was infection.

-Treatment of the infection is the only way to inhibit further stone formation.

 

Ephedrine/guaifenesin stones:

-Certain herbal and over-the-counter preparations (eg, Mah Jung) contain high levels of ephedrine and guaifenesin.  Excessive consumption of these products can lead to formation of ephedrine/guaifenesin stones.

For more information visit:
Performing Laboratory Information
Performing LocationDay(s) Test PerformedReport AvailableMethodology/Instrumentation
​Mayo Clinic Laboratories​Monday through Saturday​2 to 4 days​Infrared Spectrum Analysis
Reference Lab
For billing questions, see Contacts
Outreach CPTs
CPTModifier
(if needed)
QuantityDescriptionComments
​82365
For most current information refer to the Marshfield Laboratory online reference manual.