X-ray microdiffraction and urine: a new analysis method of crystalluria.

Area of Science:

• Urology
• Analytical Chemistry
• Materials Science

Background:

• Crystalluria analysis is crucial for diagnosing and predicting urolithiasis (kidney stone disease).
• Existing methods may lack accuracy in quantifying urine particulate matter.
• Accurate characterization of urine crystals and amorphous components is needed.

Purpose of the Study:

• To develop and validate a novel, accurate methodology for qualitative and quantitative analysis of urine particulate.
• To assess urine solid residuals in patients diagnosed with renal stone disease.

Main Methods:

• Urine samples were collected and centrifuged to isolate solid residuals.
• X-ray microdiffraction with a micro-diffractometer was employed for analyzing low residual amounts.
• Quantitative analysis was performed using the Rietveld method on 2 θ -I profiles.

Main Results:

• The proposed X-ray microdiffraction method accurately quantifies all crystalline phases and the amorphous component in urine.
• Significant increases in both amorphous and crystalline phases were observed in urine samples stored at room temperature for several days.
• The methodology is sensitive enough for analyzing very low residual amounts.

Conclusions:

• This novel X-ray microdiffraction technique offers an accurate approach for crystalluria assessment in urolithiasis.
• Prompt analysis of centrifuged urine samples is essential to prevent alterations in crystalline and amorphous content.
• The method provides valuable data for the diagnosis and prognosis of kidney stone disease.