The Dental Assisting National Board Radiation Health and Safety exam, commonly known as the DANB RHS exam, assesses a candidate’s knowledge of dental radiographic imaging, radiation safety, infection control, and quality assurance procedures.
The RHS exam can be taken as a standalone DANB component exam. It may also fulfill part of the requirements for DANB certification or state dental radiography compliance. Because certification and licensing rules vary by state, candidates should review the most current DANB guidelines and their state’s specific requirements before registering.
DANB RHS Exam Overview
| Exam name | DANB Radiation Health and Safety exam |
| Abbreviation | RHS |
| Testing organization | Dental Assisting National Board (DANB) |
| Exam format | Computer-delivered multiple-choice exam |
| Number of questions | 100 questions |
| Testing time | 75 minutes, plus additional time for tutorial and ending comments |
| Score scale | 100 to 900 |
| Passing score | 400 |
Online DANB RHS Prep Course
If you want to be fully prepared, Mometrix offers an online DANB RHS Prep Course. The course includes review lessons, practice questions, flashcards, progress tracking, and study tools designed to help you review the major areas tested on the exam.
- 30+ DANB RHS lessons
- 270+ DANB RHS practice questions
- 310+ digital flashcards
- Progress tracking
- Bonus study tools and test-taking tips
What Is Covered on the DANB RHS Exam?
The RHS exam is organized into four major content areas. These areas cover exposing and evaluating dental radiographs, quality assurance, radiation safety, and infection control.
| Content Area | Percent of Exam | Main Topics |
|---|---|---|
| Expose and Evaluate | 26% | Patient assessment and preparation, image acquisition, image evaluation, and patient management during radiographic procedures |
| Quality Assurance and Radiology Regulations | 21% | Quality assurance procedures, radiology regulations, equipment checks, documentation, and compliance expectations |
| Radiation Safety for Patients and Operators | 31% | Radiation protection, exposure reduction, patient selection, equipment operation, operator safety, patient safety, and radiation monitoring |
| Infection Control | 22% | Infection control techniques, precautions for patients and operators, and guidelines related to radiographic procedures |
High-Value Study Areas
The largest content area is Radiation Safety for Patients and Operators, followed by Expose and Evaluate and Infection Control. Those areas deserve heavy study time because they make up most of the exam.
- Review how to reduce radiation exposure for patients and dental team members.
- Know the purpose of patient selection guidelines.
- Study how to expose, evaluate, and correct dental radiographic images.
- Understand quality assurance procedures for radiographic equipment and images.
- Review infection control steps before, during, and after radiographic procedures.
- Practice identifying common radiographic errors and how to prevent them.
Who Takes the DANB RHS Exam?
The RHS exam is commonly taken by dental assistants who need to demonstrate knowledge of dental radiography and radiation safety. It may be used for DANB certification pathways, state dental radiography requirements, or employer requirements.
Because dental radiography rules vary by state, candidates should confirm the current requirement for their state, employer, or certification goal before registering. Do not rely on a general national overview as a substitute for state-specific requirements.
How Do I Register for the DANB RHS Exam?
Candidates register through DANB. During registration, candidates choose the exam, submit the required application information, pay the exam fee, and schedule a testing appointment according to the available options.
Testing rules, fees, application windows, and scheduling procedures can change, so candidates should review current DANB instructions before applying.
What Should I Expect on Test Day?
Arrive early so there is enough time for check-in. Testing center staff may verify identification, take a digital photograph, store personal items, and escort candidates to the testing station.
- Bring the identification required by your exam confirmation instructions.
- Make sure your name on your ID matches your registration information.
- Do not bring prohibited personal items into the testing room.
- Use only materials provided or allowed by the testing program.
- Follow all instructions from testing center staff.
The exam includes a tutorial before the test begins. Breaks may be allowed, but exam time may continue running during a break, so candidates should manage time carefully.
How Is the DANB RHS Exam Scored?
The RHS exam is scored on a scale from 100 to 900, with 400 listed as the passing point. Candidates receive pass/fail information after the exam, and score-reporting details may vary by testing process and current DANB policy.
Candidates who do not pass should review the performance information in their score report and focus their study on the weakest content areas before retesting.
Can I Retake the DANB RHS Exam?
Candidates who do not pass the DANB RHS exam may retake it according to current DANB policies. Retake fees, application steps, waiting periods, and state-specific rules may change, so candidates should review the latest DANB instructions before applying again.
How Can I Prepare for the DANB RHS Exam?
Begin by reviewing the RHS exam content areas and their percentages. The exam blueprint explains how much weight each topic carries, helping you decide where to focus your study time.
Next, prioritize the highest-weighted areas. Radiation safety, image exposure and evaluation, and infection control make up a large portion of the exam, so weak performance in these areas can significantly affect your score.
Practice questions are useful because they help you apply radiation safety and dental radiography knowledge the way it may appear on the exam. After each practice session, review missed questions carefully so you understand the radiographic principle, safety rule, infection control step, or quality assurance procedure behind the correct answer.
DANB RHS FAQ
How many questions are on the DANB RHS exam?
The RHS exam has 100 multiple-choice questions.
How long is the DANB RHS exam?
The exam allows 75 minutes of testing time, plus additional time for tutorial and ending comments.
What score do I need to pass the DANB RHS exam?
The score scale is 100 to 900, and the passing point is 400.
What topics are tested on the DANB RHS exam?
The exam covers exposing and evaluating radiographic images, quality assurance and radiology regulations, radiation safety for patients and operators, and infection control.
Is the DANB RHS exam required in every state?
No. Dental radiography requirements vary by state. Candidates should check their state dental board, employer, or certification requirements before registering.
