Microscopic examination of urine crystals

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like pain when urinating, blood in urine, frequent urination, or if you’ve been diagnosed with a condition that could affect crystal formation, such as kidney stones or certain kidney diseases. It can also be part of routine screening in some cases.

What to Expect During the Test

You’ll likely provide a urine sample, often collected in the morning. The sample is then examined under a microscope to identify and count different types of crystals. This process is quick and painless, usually done in a lab setting.

Common Types of Crystals Found

Crystals can vary widely, but common types include calcium oxalate (often linked to kidney stones), urate crystals (common in gout), cystine crystals (associated with cystinuria), and others. The presence of specific crystals can guide further medical evaluation.

Possible Causes of Crystals in Urine

Crystals may form due to imbalances in urine composition, such as high levels of certain minerals or acids, dehydration, dietary factors, or underlying medical conditions. Some medications can also contribute to crystal formation.