What is a crystals in urine test?Your urine contains many chemicals. Sometimes these chemicals form solids, called crystals. A crystals in urine test looks at the amount, size, and type of crystals in your urine. It's normal to have a few small urine crystals. Larger crystals or specific types of crystals can become kidney stones. Kidney stones are hard, pebble-like substances that can get stuck in the kidneys. A stone can be as small as a grain of sand, as big as a pea, or even larger. While kidney stones rarely cause serious damage, they can be very painful.Other names: urinalysis (crystals) microscopic urine analysis, microscopic examination of urine
