NAVTA Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

When collecting a free catch urine sample, it is important to get a mid-stream sample. A mid-stream sample helps to minimize contaminants from the urethra and surrounding skin, providing a more accurate representation of the urine composition. This technique involves starting the flow, then catching a portion of the urine in the container, and then stopping the flow before finishing urinating. This method helps ensure that the sample obtained is as pure as possible, improving the chances of an accurate diagnostic outcome.

The other options are incorrect because:

A. Getting a first-catch sample refers to the initial urine stream, which is more likely to contain contaminants from the urethra and surrounding skin.

B. Filling the container completely is not necessary and may lead to dilution of the sample, affecting the concentration of substances being tested.

D. Using a dirty container introduces the risk of contamination, potentially leading to inaccurate test results.