Which crystals are formed from the ammonium salt of uric acid?

Ammonium biurate crystals are indeed formed from the ammonium salt of uric acid. They typically appear in alkaline urine and can be indicative of certain metabolic abnormalities. The presence of these crystals can suggest that the urine is supersaturated with uric acid, potentially leading to conditions like gout or kidney stones.

Ammonium biurate crystals usually have a characteristic "thorny apple" appearance when viewed under a microscope, which helps in their identification. Their formation is a result of the reaction between ammonia and uric acid in urine, thereby highlighting their nature as an ammonium salt.

Understanding the characteristics and formation of ammonium biurate is crucial for interpreting urine analysis results, as it can provide insights into the patient’s metabolic state and kidney function.