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Urinalysis – Physical And Biochemical Practice Test

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Thorny apple crystals correspond to which compound?
Correct Answer:
Ammonium biurate
Explanation:
Thorny apple crystals are ammonium biurate. They form in urine that is alkaline or has aged, when ammonia combines with uric acid to create ammonium biurate crystals. These crystals have a distinctive yellow-brown color with radiating spicules, giving the thorny apple appearance. This morphology is specific and helps distinguish them from other common crystals: calcium oxalate crystals are envelope or dumbbell-shaped, uric acid crystals are rhomboid or rosettes, and cholesterol crystals are plate-like. So the thorny, spiky appearance points to ammonium biurate.

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