What is the required urine volume for drug testing?

What is the required urine volume for drug testing?

• A. 35-45 mL
• B. 10-20 mL
• C. 50-60 mL
• D. 5-9 mL

Answer: (A)

Urine volume must be sufficient to complete the required testing and to provide a split specimen if needed. The commonly accepted range of about 35 to 45 mL ensures there is enough material for the initial screening and, if a confirmatory test is required, for that process as well. It also leaves adequate volume for creating a split sample without compromising the integrity of any portion. A volume of 5–9 mL is far too small to perform the full testing sequence or to provide a reliable split specimen. 10–20 mL might be insufficient for all steps in many programs, risking invalid results or the need for retesting. 50–60 mL is more than typical requirements and not necessary for standard protocols, making it unnecessarily large.

Urine volume must be sufficient to complete the required testing and to provide a split specimen if needed. The commonly accepted range of about 35 to 45 mL ensures there is enough material for the initial screening and, if a confirmatory test is required, for that process as well. It also leaves adequate volume for creating a split sample without compromising the integrity of any portion.

A volume of 5–9 mL is far too small to perform the full testing sequence or to provide a reliable split specimen. 10–20 mL might be insufficient for all steps in many programs, risking invalid results or the need for retesting. 50–60 mL is more than typical requirements and not necessary for standard protocols, making it unnecessarily large.