Kidney Stone Analysis STONE

Synonyms

Allscripts (AEHR) Order Name

Kidney Stone Analysis

Sunrise Clinical Manager (SCM) Order Name

Calculus Analysis

Clinical Info

Managing patients with recurrent renal calculi (kidney stones)
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.

Specimen Type

Other

Container

Sterile

Collection Instructions

Sources: Bladder Passed Stone, Prostate, Urethra, Urinary Tract, Kidney, Left Kidney, Right Kidney, Renal, Left Renal, Right Renal, Ureter, Left Ureter, Right Ureter
Upon arrival in the performing laboratory, all stone specimens and the containers in which they are received will be inspected. Prior to analysis, stones must be clean and dry.
Container/Tube: Sterile specimen container
Volume: Entire dried calculi specimen
Transport Temperature: Room Temperature
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.

Note: Please Indicate source on sample

Transport Instructions

Room Temperature

Specimen Stability

365 Days Room Temperature, Refrigerated or Frozen

Methodology

Infrared Spectrum Analysis

Days Performed

TAT: 5-7 Days

Performing Laboratory

Mayo Medical Laboratories

CPT

82365
LOINC Code: 74446-6

PDM

5900057

Result Interpretation

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

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.

-Production 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 the formation of ephedrine/guaifenesin stones.

Forms