Urine crystal analysis can identify crystals associated with gout or purine metabolism disorders.

• A. Uric acid crystals.
• B. Calcium oxalate crystals.
• C. Cystine crystals.
• D. Struvite crystals.

Answer: (B)

Urine crystal analysis looks for specific crystal types that reflect particular metabolic problems. Crystals formed from uric acid (urates) are the classic finding linked to gout and disorders of purine metabolism, because excess purines are broken down to uric acid and can precipitate as crystals in urine. These uric acid crystals are typically needle- or rhomboid-shaped and are more likely to be seen in acidic urine. This connection to guot/purine metabolism makes uric acid crystals the most relevant indicator in this context.

Calcium oxalate crystals are common in urine and can arise from various situations like high calcium, oxalate load, or dehydration, but they are not specifically associated with gout or purine metabolism. Cystine crystals point to cystinuria, and struvite crystals are associated with infection by urease-producing bacteria.