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.

Learn more about The Urine Microscopic: Microscopic Analysis of Urine Sediment (online CE course)
Crystals

Crystals are not usually present in freshly voided urine but can appear in urine left at room temperature for several hours. Most crystals form due to changes in urine pH and temperature after collection. Diagnostically significant crystals may indicate the presence of a metabolic disorder, renal calculi formation, or provide information that can be used to regulate medications.