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What does “urate crystals” mean?

Dec 28, 2021 Source: Cainiu Health
Dr. Zhao Xinju
Introduction
Uric acid is one of the end products of purine metabolism. Elevated urinary uric acid levels may result from disorders of purine metabolism or reduced renal excretion of uric acid. Prolonged hyperuricemia can even lead to deposition of urate crystals in tissues, potentially damaging renal structure.

Urate crystals comprise various substances. They form a thin, translucent film on the surface of alkaline or near-neutral urine. Among these, triple phosphate (struvite) crystals are colorless and transparent. Their shape may vary—sometimes resembling roof tiles or prisms, but occasionally appearing fern-like.

What Are Urate Crystals?

Uric acid is one of the end products of purine metabolism. Elevated urinary uric acid levels may indicate disorders such as impaired purine metabolism or reduced renal excretion of uric acid. Chronically elevated uric acid levels can lead to deposition of urate crystals within tissues, potentially damaging renal structure.

Urate crystals dissolve readily in acetic acid. Even healthy individuals may excrete small amounts of triple phosphate crystals in their urine. However, persistent detection of abundant calcium phosphate crystals warrants prompt medical evaluation, as this may signal conditions including hyperparathyroidism, renal tubular acidosis, or bone demineralization.

Moreover, long-standing presence of phosphate crystals in urine increases the risk of developing phosphate stone formation—typically mixed calculi composed of calcium carbonate apatite and calcium phosphate. Such stones tend to form in alkaline urine, where phosphate crystallization is favored, and may also be associated with alterations in urinary mucoproteins. When infection contributes to stone formation, magnesium ammonium phosphate (struvite) crystals are commonly observed in the urine.

To observe urate crystals, allow a urine sample to stand undisturbed for some time; white precipitates may then appear. The precipitation of salt crystals from urine is termed “crystalluria.” Crystalluria commonly occurs when bodily hydration is insufficient, leading to concentrated urine and increased likelihood of urate crystal formation.

We hope the above information is helpful to you. Wishing you good health and happiness!

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