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. Kidney stone disease is a common disease with multifactorial etiopathogenesis. Fourier Transform Infrared Spectroscopy (FTIR) is a technique to determine the composition of a stone with respect to the nature and percentage of compounds present in the stone.This technique recognizes small fractions of multiple components as percentages, present in a stone whereas conventional methods recognizes only commonly occurring stone components. The routine, easy and rapid measurements give unambiguous information about the stone composition.
Day 1: 50 mL aliquot of 24-hour urine. Do not use preservatives. Mention total volume on Test Request Form & label container as Non-acidified urine. Day 2: 50 mL (30 mL min.) aliquot of 24 hour urine. Collect urine with 25 mL 50% concentrated HCl to maint
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