Bilirubin Crystals

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The page below is a sample from the LabCE course The Urine Microscopic: Microscopic Analysis of Urine Sediment. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Bilirubin Crystals

Bilirubin crystals are seen in the urine when the serum bilirubin level is increased. The macroscopic appearance of urine with bilirubin crystals is orange to almost black in color. The crystals themselves appear as gold-orange needle-like forms that are sometimes clumped together.