What quantity of urine is typically collected for urinalysis?

For a typical urinalysis, a urine sample volume of 20 to 30 mL is usually collected. This quantity is sufficient to perform a variety of tests including dipstick analysis, microscopic examination, and culture when needed.

Collecting this amount also allows for adequate sample handling and processing without risking contamination or dilution, which could affect test results. Smaller volumes, such as 10 mL, may not provide enough material for all necessary tests or could limit the reliability of the results. While larger volumes, like 50 mL or 100 mL, could be collected, they exceed the standard requirement and could be unnecessarily cumbersome for both collection and processing. The established range of 20 to 30 mL balances the need for sufficient sample size with practical considerations for both patients and laboratory technicians.