The CDR Registered Dietitian (RD) exam is the gateway to becoming a Registered Dietitian — the most recognized and credentialed nutrition professional.

Exam Format

• •Total Questions: 125-145 (computer-adaptive)
• •Time Limit: 2.5 hours
• •Passing Score: Scaled score of 25 on 0-50 range
• •Cost: $225
• •Format: Computer-adaptive (difficulty adjusts based on your answers)

What Makes the RD Exam Challenging?

1. Computer-Adaptive Format

The CAT format means questions get harder as you answer correctly. You can’t go back to change answers, which adds pressure. Each question is important.

2. Breadth of Content

The exam covers food science, biochemistry, medical nutrition therapy, foodservice management, research, and counseling. You need competence across all domains.

3. Medical Nutrition Therapy Depth

Forty-five percent of the exam covers nutrition care — including complex disease states like renal failure, liver disease, critical care, and eating disorders. This requires deep clinical knowledge.

4. Master’s Degree Requirement

Since January 2024, a master’s degree is required to take the RD exam. The content reflects graduate-level expectations.

Pass Rates and Statistics

Frequently Asked Questions

What is the pass rate for the RD exam?

CDR reports that first-time pass rates for RD candidates from accredited programs typically range from 70-85%, depending on the program. The national average is approximately 75-80%.

Can I retake the RD exam if I fail?

Yes. You can retake the exam after a 45-day waiting period. There is no limit on the number of attempts, but each attempt requires paying the $225 exam fee.

Is the RD exam harder than the DTR exam?

Both exams use the same computer-adaptive format. The RD exam expects a higher level of knowledge consistent with master’s-level education. The RD exam is generally considered more challenging.