Urinary stone - morphologic and infrared analysis
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CAL
Synonyms
- Stone analysis
- urinary lithiasis
- Urinary calculi
Clinic significance
Lithiasis is a common problem which affects between 4 and 20% of the population (according to different studies). It recurs at least once in 60% of cases and many times in 5 to 6% of patients, putting them at risk of renal insufficiency. Examination of the morphology and composition of a calculus helps identify the biochemical factors underlying the lithiasis and thus aids with both defining the etiology of the problem (e.g. metabolic disease, nutritional factors, etc.) and deciding on appropriate preventive treatment. The examination consists of two different steps :
- binocular microscope examination of the surface and, after sectioning, successive internal layers of the calculus - to include inspection of the nucleus, if there is one;
- infrared spectrophotometry to analyze the composition of the calculus,
- identification of all organic or mineral material, both amorphous and crystalline,
- analysis of the different crystalline substances present,
- semi-quantitative estimation of the amounts of the various different substances present,
- localization of all the substances contained in the calculus (analysis of successive layers going from the nucleus out to the surface),
- screening for drug-induced and false calculi.
Prenalytics
- stone(s) or filtered urinary deposit
- Ambient temperature
Further information
- Enclose the specific clinical information form (R32-INTGB urinary tract lithiasis)
- Send the entire calculus, previously washed and dried in a sterile container which does not contain any compound (no borate in particular). Urines is not accepted.
Documents to download
Methodology
Morphological analysis and infrared spectrophotometry (SPIR)
Turnaround time
14 days
Pathologist(s) in charge
Specialty
Contact(s)
Dr Gilles PANTEIX
Phone(s)
+334 72 80 10 41