Starch Granules and Urinary 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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Starch Granules and Urinary Crystals

Cornstarch, talcum powder, and other starch materials may be mistaken for crystals. A drop or two of dilute iodine solution will stain the starch particles blue-black; crystals would not stain blue-black with iodine.