A nurse anesthetist gives you anesthesia care before, during, and after surgery or labor and delivery. The nurse constantly watches every important function of your body. They can change the anesthesia medicine to make sure you are safe and comfortable. A nurse anesthetist has a bachelor's degree in nursing and at least one year of experience as a registered nurse in a critical-care setting. A CRNA also has at least a master's degree from a nurse anesthetist program. Nurse anesthetists must pass a national certification exam to become CRNAs.