# 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

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=482449  
> language: ko  
> subject: Urinalysis & Body Fluids · 요·체액검사

## 문제

Microscopic examination of urine sediment reveals colorless, octahedral (envelope-shaped) crystals. These crystals are composed of:

![calcium oxalate crystals urine microscopy envelope · Composition: Calcium oxalate crystals are made up of calcium and oxalate ions. They can come in two primary forms: calcium oxalate monohydrate (COM](https://mymerci.kr/data/asset/histo/482449.webp)

출처: Ajay Kumar Chaurasiya, CC-BY-SA via Wikimedia Commons

## 보기

1. Uric acid
2. Calcium oxalate **✔ 정답**
3. Triple phosphate
4. Cystine

**정답: 2**

## 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.

## 핵심 개념

- **calcium oxalate crystals urine microscopy envelope**

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