Objective: To assess the correlation of crystal in urine and urinary tract stone composition.
Materials and Methods: For urinalysis study, 617 urolithiasis patients seeking for treatment in Songklanagarind Hospital during 1996 - 2000 who provided the stone for analysis with infrared spectroscopy were enrolled.
Results: 71.9% of urolithiasis patients had urine specific gravity between 1.015-1.025 and 43.3% had urine pH 5.0. For microscopic study, 68.7% of urolithiasis patients showed abnormal urine and 8.8% revealed crystal in urine. Stone composition was the same as those of crystals in 76.5% of patients with oxalate crystals and 75% of those with uric acid crystals.
Conclusion: Urolithiasis patients with oxalate and uric acid crystal in urine showed correlation between the type of crystal and composition of the stone.