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©2013 UpToDate ® Print Email Urinary calcium oxalate monohydrate crystals under polarized light Urine sediment viewed under polarized light showing coarse, needle-shaped calcium oxalate monohydrate crystals. These crystals have a similar appearance to hippurate crystals. Courtesy of W Merrill Hicks, MD.
©2013 UpToDate ® Print Email Urinary calcium oxalate monohydrate crystals under polarized light Urine sediment viewed under polarized light showing coarse, needle-shaped calcium oxalate monohydrate crystals. These crystals have a similar appearance to hippurate crystals. Courtesy of W Merrill Hicks, MD. Calcium oxalate crystals in the urine Urine sediment showing both dumbbell-shaped calcium oxalate monohydrate (long arrow) and envelope-shaped calcium oxalate dihydrate (short arrows) crystals. Although not shown, the monohydrate crystals may also have a needle-shaped appearance. The formation of calcium oxalate crystals is independent of the urine pH. Courtesy of Frances Andrus, BA, Victoria Hospital, London, Ontario.