Urinalysis · Pathology

Which crystal is described as a 'colorless, hexagonal plate' and is indicative of a rare metabolic defect?

  1. Tyrosine
  2. Leucine
  3. Cystine
  4. Cholesterol
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Correct answer: Cystine

Cystine crystals appear as colorless, flat, hexagonal plates and are diagnostic of cystinuria. They are found in acidic urine and are often confused with uric acid, but unlike uric acid, they do not polarize multiple colors.

Difficulty: Medium Question 15 of 20

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