A dialysis catheter is a catheter used for exchanging blood to and from a hemodialysis machine and a patient. The dialysis catheter contains two lumens: venous and arterial. This terminology is confusing, because both lumens are in the vein.
In order to practice as a dental hygienist, one needs a degree from a dental hygiene school and a state license. To become licensed, dental hygienists need to pass a clinical and written exam.
In California, only an associate degree is required to become a hygienist. I have a bachelor's degree but I have no idea if any of my employers preferred it because I never asked. I've been working full-time for the past 16 years as a dental hygienist with only an associates degree in dental hygiene. In clinical practice hygienists are paid the same rate with or without a bachelors.