What is the maximum amount of urine that should be sent to an outside lab?

The maximum amount of urine that should be sent to an outside lab is typically around 25 ml. This quantity is sufficient to perform a wide range of tests while minimizing the risk of contamination and ensuring that the sample remains viable for examination.

Sending 25 ml allows the laboratory to perform multiple tests if necessary, including urinalysis and culture, without overfilling or wasting the sample. Larger volumes, while potentially useful for certain tests, may not be necessary for routine analyses and could lead to complications, such as increased risk of degradation or contamination during transport.

This standard volume reflects practical considerations within clinical practice, balancing the need for adequate sample size with ease of handling and transport.