Which of the following urine specimens should a medical assistant collect from a patient for the diagnosis of a urinary tract infection?

A second-voided urine specimen is collected after the first urination but may still contain contaminants from the urethra or bladder. This collection method does not ensure the same level of cleanliness and accuracy as a clean-catch midstream sample, which is specifically designed to reduce contamination.

A 2-hour postprandial urine specimen is collected after eating, primarily used to assess glucose levels rather than for diagnosing UTIs. This collection method may not accurately reflect the presence of pathogens or inflammatory markers associated with urinary tract infections, making it unsuitable for that purpose.

A 24-hour urine collection captures all urine produced over a day, providing a comprehensive overview of substances excreted by the kidneys. However, it is impractical for diagnosing UTIs, as it does not focus on a specific point in time, and results may be affected by varying factors throughout the day.