Microscopic examination of urine sediment reveals colorless, octahedral (envelope-shaped) crystals. These crystals are composed of: 출처: Ajay Kumar Chaurasiya, CC-BY-SA via Wikimedia Commons
1Uric acid
2Calcium oxalate✓ 정답
3Triple phosphate
4Cystine
해설
Envelope- or octahedron-shaped colorless crystals are dihydrate calcium oxalate, seen in acidic-to-neutral urine and ethylene glycol ingestion. Uric acid is pleomorphic/yellow, triple phosphate is coffin-lid, cystine is hexagonal.