What are the variations that will occur when urine sample is left on the bench for a long time?

When a urine sample is left on the bench for an extended period, it can undergo several changes. Bacteria may multiply, leading to increased turbidity and possibly altering the pH. Additionally, compounds such as urea can break down into ammonia, causing a strong odor and further affecting the sample's chemical composition. Overall, the sample's appearance, odor, and chemical properties may significantly change, compromising its accuracy for analysis.