What is crystalluria?

Crystalluria refers to the presence of crystals in the urine. These crystals can result from various factors, including dietary changes, dehydration, or metabolic disorders. The formation of crystals can indicate potential health issues, such as urinary tract infections or stone formation. Each type of crystal can also provide specific insights into the animal's metabolic state.

The other options pertain to different urinary conditions. The presence of fat cells in urine refers to a condition known as lipuria, which can indicate fat metabolism disorders. Mucus threads are not related to crystal formation and may occur in various situations but do not signify crystalluria. High refractivity in urine can indicate concentrated urine but does not directly correlate to the presence of crystals. Therefore, the definition of crystalluria accurately captures its significance in veterinary diagnostics and health monitoring.