Which of the following is an example of a CLIA-waived test?

This procedure involves analyzing urine samples under a microscope to identify cells, crystals, and bacteria. It requires specific training and knowledge to interpret the results accurately, making it too complex for CLIA-waived status. This test is therefore classified as moderate complexity under CLIA regulations.

Gram staining is a laboratory technique used to differentiate bacterial species based on their cell wall properties. This process involves several steps, including the use of specific reagents and the interpretation of results under a microscope, which requires trained personnel. As such, it does not meet the criteria for CLIA-waived tests.

A prenatal profile typically encompasses a series of tests to assess the health of a pregnant individual and their fetus, including blood tests and ultrasounds. Given its complexity and the need for specialized interpretation, it is categorized as a moderate to high-complexity test under CLIA standards, thus not qualifying as CLIA-waived.