Which of the following CLIA-waived tests can a medical assistant perform?

Analysis of urine sediment involves microscopic examination and interpretation of urine samples, which requires more extensive training and understanding of laboratory procedures. This complexity prevents it from being classified as a CLIA-waived test, thus limiting its performance to licensed laboratory personnel.

Gram stain procedures are vital for identifying bacterial infections through differential staining of microorganisms. This process requires specific technical skills and knowledge to interpret results accurately, disqualifying it from the CLIA-waived category. Therefore, only qualified laboratory staff should conduct this test.

A complete blood count (CBC) with differential is a comprehensive blood test that assesses various components of blood. Due to the complexity and need for precise interpretation of results, this test is not CLIA-waived and must be performed by trained laboratory professionals to ensure accuracy.