What is the minimum preferred volume of urine for a routine urinalysis?

The minimum preferred volume of urine for a routine urinalysis is typically around 30 mL. This volume is sufficient to conduct various tests, such as physical, chemical, and microscopic examinations, which are essential components of a standard urinalysis. A sample size of 30 mL ensures that there is enough urine to perform these analyses accurately and reliably, as it allows for the detection of abnormalities like the presence of glucose, protein, blood, and other substances.

Higher volumes, while useful, are not necessary for a routine assessment and may lead to wastage or handling complications. Conversely, samples smaller than 30 mL may not provide enough material for certain tests or could result in inconclusive findings. Therefore, 30 mL is regarded as the optimal minimum volume for healthcare professionals to obtain accurate and comprehensive results in a urinalysis.