Missouri (Exam Fees Vary) Visit Site Certified Nurse Assistant (CNA) Missouri CNA Challenge https://health.mo.gov/safety/cnaregistry/cna.php CNA Certified Nurse Assistant (CNA) Visit Site Certified Nurse Assistant (CNA) CNA Exam MO Department of Health and Senior Services Missouri’s Department of Health and Senior Services Missouri Department of Health & Senior Services http://health.mo.gov/safety/cnaregistry/cna.php#challenge Certified Nurse Assistant (CNA)