Final answer:
RDHs must complete a board-approved course for certain advanced functions, varying by jurisdiction, and use specific materials like a test card, patient serum sample, and test reagent for diagnostic tests.
Step-by-step explanation:
Registered Dental Hygienists (RDHs) must achieve satisfactory completion of a board-approved course of instruction for three specific functions before they can perform them independently. These functions typically involve advanced tasks beyond basic dental hygiene, such as administering local anesthesia, nitrous oxide sedation, and performing restorative procedures, among others. Regulations can vary by jurisdiction, so it's important for RDHs to be familiar with the rules governing their practice in their specific state or country.
To perform certain tests or procedures, an RDH may need to use specific materials such as a test card, patient serum sample, and a test reagent. For example, in some settings, an RDH might use a test reagent that is a suspension of horse erythrocytes for certain types of diagnostic tests. Completing the required educational courses ensures that RDHs have the necessary knowledge and skills to safely and effectively perform these specialized functions.