True or False: Urine samples should ideally be examined within 2 hours of collection.

The statement that urine samples should ideally be examined within 2 hours of collection is true. This timeframe is important because, as urine sits at room temperature, various changes can occur that might affect the accuracy of the test results.

For instance, the breakdown of substances in the urine, such as glucose and ketones, can occur rapidly if the sample is not processed in a timely manner. Additionally, bacterial growth can increase if the sample is left at room temperature, potentially leading to false positives in cultures. Moreover, changes in the pH of urine may occur, influencing results for various analyses, including those for protein and specific gravity.

While preservatives and sterile containers can help in maintaining the stability and sterility of urine samples, they do not negate the importance of timely examination. The two-hour window for analysis is a standard practice aimed at ensuring the most accurate and reliable results. Therefore, prompt examination is critical.